15031997 has 2 divisors, whose sum is σ = 15031998. Its totient is φ = 15031996.

The previous prime is 15031981. The next prime is 15032089. The reversal of 15031997 is 79913051.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11115556 + 3916441 = 3334^2 + 1979^2 .

It is an emirp because it is prime and its reverse (79913051) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 15031997 - 2⁴ = 15031981 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 (15031937) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7515998 + 7515999.

It is an arithmetic number, because the mean of its divisors is an integer number (7515999).

Almost surely, 2^15031997 is an apocalyptic number.

It is an amenable number.

15031997 is a deficient number, since it is larger than the sum of its proper divisors (1).

15031997 is an equidigital number, since it uses as much as digits as its factorization.

15031997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8505, while the sum is 35.

The square root of 15031997 is about 3877.1119406073. Note that the first 3 decimals coincide. The cubic root of 15031997 is about 246.7964415322.

The spelling of 15031997 in words is "fifteen million, thirty-one thousand, nine hundred ninety-seven".