Search a number
1961369 = 8212389
BaseRepresentation
bin111011110110110011001
310200122111022
413132312121
51000230434
6110012225
722446164
oct7366631
93618438
101961369
11111a673
127a7075
13538997
1528b22e
hex1ded99

1961369 has 4 divisors (see below), whose sum is σ = 1964580. Its totient is φ = 1958160.

The previous prime is 1961363. The next prime is 1961381. The reversal of 1961369 is 9631691.

It can be divided in two parts, 196 and 1369, that multiplied together give a square (268324 = 5182).

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9631691 = 59163249.

It can be written as a sum of positive squares in 2 ways, for example, as 490000 + 1471369 = 700^2 + 1213^2 .

It is a cyclic number.

It is not a de Polignac number, because 1961369 - 216 = 1895833 is a prime.

It is a super-2 number, since 2×19613692 = 7693936708322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1961363) 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, 374 + ... + 2015.

It is an arithmetic number, because the mean of its divisors is an integer number (491145).

21961369 is an apocalyptic number.

It is an amenable number.

1961369 is a deficient number, since it is larger than the sum of its proper divisors (3211).

1961369 is an equidigital number, since it uses as much as digits as its factorization.

1961369 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3210.

The product of its digits is 8748, while the sum is 35.

The square root of 1961369 is about 1400.4888432258. The cubic root of 1961369 is about 125.1756251309.

The spelling of 1961369 in words is "one million, nine hundred sixty-one thousand, three hundred sixty-nine".

Divisors: 1 821 2389 1961369