15985231 has 2 divisors, whose sum is σ = 15985232. Its totient is φ = 15985230.

The previous prime is 15985199. The next prime is 15985241. The reversal of 15985231 is 13258951.

It is a strong prime.

It is an emirp because it is prime and its reverse (13258951) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 15985231 - 2⁵ = 15985199 is a prime.

It is a super-2 number, since 2×15985231² = 511055220246722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15985241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7992615 + 7992616.

It is an arithmetic number, because the mean of its divisors is an integer number (7992616).

Almost surely, 2^15985231 is an apocalyptic number.

15985231 is a deficient number, since it is larger than the sum of its proper divisors (1).

15985231 is an equidigital number, since it uses as much as digits as its factorization.

15985231 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10800, while the sum is 34.

The square root of 15985231 is about 3998.1534487811. The cubic root of 15985231 is about 251.9066537194.

The spelling of 15985231 in words is "fifteen million, nine hundred eighty-five thousand, two hundred thirty-one".