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3121969 = 4197451
BaseRepresentation
bin1011111010001100110001
312212121112111
423322030301
51244400334
6150525321
735351644
oct13721461
95777474
103121969
111842644
121066841
13854026
145b3a5b
1541a064
hex2fa331

3121969 has 4 divisors (see below), whose sum is σ = 3129840. Its totient is φ = 3114100.

The previous prime is 3121961. The next prime is 3121973. The reversal of 3121969 is 9691213.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 3121969 - 23 = 3121961 is a prime.

It is a super-2 number, since 2×31219692 = 19493380873922, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an Ulam number.

It is a Duffinian number.

3121969 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 3121969.

It is not an unprimeable number, because it can be changed into a prime (3121961) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3307 + ... + 4144.

It is an arithmetic number, because the mean of its divisors is an integer number (782460).

Almost surely, 23121969 is an apocalyptic number.

It is an amenable number.

3121969 is a deficient number, since it is larger than the sum of its proper divisors (7871).

3121969 is an equidigital number, since it uses as much as digits as its factorization.

3121969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7870.

The product of its digits is 2916, while the sum is 31.

The square root of 3121969 is about 1766.9094487268. The cubic root of 3121969 is about 146.1536038990.

The spelling of 3121969 in words is "three million, one hundred twenty-one thousand, nine hundred sixty-nine".

Divisors: 1 419 7451 3121969