15631397 has 2 divisors, whose sum is σ = 15631398. Its totient is φ = 15631396.

The previous prime is 15631349. The next prime is 15631411. The reversal of 15631397 is 79313651.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10764961 + 4866436 = 3281^2 + 2206^2 .

It is an emirp because it is prime and its reverse (79313651) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 15631397 - 2⁶ = 15631333 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15631597) 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, 7815698 + 7815699.

It is an arithmetic number, because the mean of its divisors is an integer number (7815699).

Almost surely, 2^15631397 is an apocalyptic number.

It is an amenable number.

15631397 is a deficient number, since it is larger than the sum of its proper divisors (1).

15631397 is an equidigital number, since it uses as much as digits as its factorization.

15631397 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17010, while the sum is 35.

The square root of 15631397 is about 3953.6561560156. The cubic root of 15631397 is about 250.0341126784.

The spelling of 15631397 in words is "fifteen million, six hundred thirty-one thousand, three hundred ninety-seven".