15457997 has 2 divisors, whose sum is σ = 15457998. Its totient is φ = 15457996.

The previous prime is 15457991. The next prime is 15458011. The reversal of 15457997 is 79975451.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15413476 + 44521 = 3926^2 + 211^2 .

It is a cyclic number.

It is not a de Polignac number, because 15457997 - 2¹⁸ = 15195853 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 (15457991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7728998 + 7728999.

It is an arithmetic number, because the mean of its divisors is an integer number (7728999).

Almost surely, 2^15457997 is an apocalyptic number.

It is an amenable number.

15457997 is a deficient number, since it is larger than the sum of its proper divisors (1).

15457997 is an equidigital number, since it uses as much as digits as its factorization.

15457997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 396900, while the sum is 47.

The square root of 15457997 is about 3931.6659318920. The cubic root of 15457997 is about 249.1061250931.

The spelling of 15457997 in words is "fifteen million, four hundred fifty-seven thousand, nine hundred ninety-seven".