15652991 has 2 divisors, whose sum is σ = 15652992. Its totient is φ = 15652990.

The previous prime is 15652943. The next prime is 15653003. The reversal of 15652991 is 19925651.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 15652991 - 2¹⁸ = 15390847 is a prime.

It is a super-2 number, since 2×15652991² = 490032254492162, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15652921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7826495 + 7826496.

It is an arithmetic number, because the mean of its divisors is an integer number (7826496).

Almost surely, 2^15652991 is an apocalyptic number.

15652991 is a deficient number, since it is larger than the sum of its proper divisors (1).

15652991 is an equidigital number, since it uses as much as digits as its factorization.

15652991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 24300, while the sum is 38.

The square root of 15652991 is about 3956.3861035041. The cubic root of 15652991 is about 250.1491962775.

The spelling of 15652991 in words is "fifteen million, six hundred fifty-two thousand, nine hundred ninety-one".