15331397 has 2 divisors, whose sum is σ = 15331398. Its totient is φ = 15331396.

The previous prime is 15331369. The next prime is 15331411. The reversal of 15331397 is 79313351.

15331397 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8116801 + 7214596 = 2849^2 + 2686^2 .

It is a cyclic number.

It is not a de Polignac number, because 15331397 - 2⁶ = 15331333 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15331307) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7665698 + 7665699.

It is an arithmetic number, because the mean of its divisors is an integer number (7665699).

Almost surely, 2^15331397 is an apocalyptic number.

It is an amenable number.

15331397 is a deficient number, since it is larger than the sum of its proper divisors (1).

15331397 is an equidigital number, since it uses as much as digits as its factorization.

15331397 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8505, while the sum is 32.

The square root of 15331397 is about 3915.5327862246. The cubic root of 15331397 is about 248.4242056913.

The spelling of 15331397 in words is "fifteen million, three hundred thirty-one thousand, three hundred ninety-seven".