15961619 has 2 divisors, whose sum is σ = 15961620. Its totient is φ = 15961618.

The previous prime is 15961597. The next prime is 15961637. The reversal of 15961619 is 91616951.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15961619 is a prime.

It is a super-2 number, since 2×15961619² = 509546562202322, which contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (15961819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7980809 + 7980810.

It is an arithmetic number, because the mean of its divisors is an integer number (7980810).

Almost surely, 2^15961619 is an apocalyptic number.

15961619 is a deficient number, since it is larger than the sum of its proper divisors (1).

15961619 is an equidigital number, since it uses as much as digits as its factorization.

15961619 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14580, while the sum is 38.

The square root of 15961619 is about 3995.1994943932. The cubic root of 15961619 is about 251.7825610293.

The spelling of 15961619 in words is "fifteen million, nine hundred sixty-one thousand, six hundred nineteen".