15331997 has 2 divisors, whose sum is σ = 15331998. Its totient is φ = 15331996.

The previous prime is 15331973. The next prime is 15332021. The reversal of 15331997 is 79913351.

It is a balanced prime because it is at equal distance from previous prime (15331973) and next prime (15332021).

It can be written as a sum of positive squares in only one way, i.e., 7873636 + 7458361 = 2806^2 + 2731^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15331997 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 15331997.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15331907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7665998 + 7665999.

It is an arithmetic number, because the mean of its divisors is an integer number (7665999).

Almost surely, 2^15331997 is an apocalyptic number.

It is an amenable number.

15331997 is a deficient number, since it is larger than the sum of its proper divisors (1).

15331997 is an equidigital number, since it uses as much as digits as its factorization.

15331997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 25515, while the sum is 38.

The square root of 15331997 is about 3915.6094034007. The cubic root of 15331997 is about 248.4274463740.

The spelling of 15331997 in words is "fifteen million, three hundred thirty-one thousand, nine hundred ninety-seven".