15913231 has 2 divisors, whose sum is σ = 15913232. Its totient is φ = 15913230.

The previous prime is 15913229. The next prime is 15913243. The reversal of 15913231 is 13231951.

It is a weak prime.

It is an emirp because it is prime and its reverse (13231951) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 15913231 - 2¹ = 15913229 is a prime.

It is a super-2 number, since 2×15913231² = 506461841718722, which contains 22 as substring.

Together with 15913229, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 15913196 and 15913205.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15913291) 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, 7956615 + 7956616.

It is an arithmetic number, because the mean of its divisors is an integer number (7956616).

Almost surely, 2^15913231 is an apocalyptic number.

15913231 is a deficient number, since it is larger than the sum of its proper divisors (1).

15913231 is an equidigital number, since it uses as much as digits as its factorization.

15913231 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 810, while the sum is 25.

The square root of 15913231 is about 3989.1391301884. The cubic root of 15913231 is about 251.5278753652.

The spelling of 15913231 in words is "fifteen million, nine hundred thirteen thousand, two hundred thirty-one".