15319391 has 2 divisors, whose sum is σ = 15319392. Its totient is φ = 15319390.

The previous prime is 15319379. The next prime is 15319399. The reversal of 15319391 is 19391351.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 15319391 - 2⁶ = 15319327 is a prime.

It is a super-2 number, since 2×15319391² = 469367481221762, 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 (15319399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7659695 + 7659696.

It is an arithmetic number, because the mean of its divisors is an integer number (7659696).

Almost surely, 2^15319391 is an apocalyptic number.

15319391 is a deficient number, since it is larger than the sum of its proper divisors (1).

15319391 is an equidigital number, since it uses as much as digits as its factorization.

15319391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3645, while the sum is 32.

The square root of 15319391 is about 3913.9993612672. Note that the first 3 decimals coincide. The cubic root of 15319391 is about 248.3593418500.

The spelling of 15319391 in words is "fifteen million, three hundred nineteen thousand, three hundred ninety-one".