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121881 = 340627
BaseRepresentation
bin11101110000011001
320012012010
4131300121
512400011
62340133
71015224
oct356031
9205163
10121881
1183631
125a649
1343626
14325bb
15261a6
hex1dc19

121881 has 4 divisors (see below), whose sum is σ = 162512. Its totient is φ = 81252.

The previous prime is 121867. The next prime is 121883. The reversal of 121881 is 188121.

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 not a de Polignac number, because 121881 - 29 = 121369 is a prime.

It is a super-2 number, since 2×1218812 = 29709956322, which contains 22 as substring.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121883) 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, 20311 + ... + 20316.

It is an arithmetic number, because the mean of its divisors is an integer number (40628).

2121881 is an apocalyptic number.

It is an amenable number.

121881 is a deficient number, since it is larger than the sum of its proper divisors (40631).

121881 is an equidigital number, since it uses as much as digits as its factorization.

121881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40630.

The product of its digits is 128, while the sum is 21.

The square root of 121881 is about 349.1145943669. The cubic root of 121881 is about 49.5806256711.

It can be divided in two parts, 121 and 881, that multiplied together give a palindrome (106601).

The spelling of 121881 in words is "one hundred twenty-one thousand, eight hundred eighty-one".

Divisors: 1 3 40627 121881