15312131 has 2 divisors, whose sum is σ = 15312132. Its totient is φ = 15312130.

The previous prime is 15312107. The next prime is 15312149. The reversal of 15312131 is 13121351.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 15312131 - 2¹⁸ = 15049987 is a prime.

It is a super-2 number, since 2×15312131² = 468922711522322, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (15312151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7656065 + 7656066.

It is an arithmetic number, because the mean of its divisors is an integer number (7656066).

Almost surely, 2^15312131 is an apocalyptic number.

15312131 is a deficient number, since it is larger than the sum of its proper divisors (1).

15312131 is an equidigital number, since it uses as much as digits as its factorization.

15312131 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 90, while the sum is 17.

The square root of 15312131 is about 3913.0718112501. The cubic root of 15312131 is about 248.3201023935.

Adding to 15312131 its reverse (13121351), we get a palindrome (28433482).

The spelling of 15312131 in words is "fifteen million, three hundred twelve thousand, one hundred thirty-one".