15972157 has 2 divisors, whose sum is σ = 15972158. Its totient is φ = 15972156.

The previous prime is 15972149. The next prime is 15972193. The reversal of 15972157 is 75127951.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14092516 + 1879641 = 3754^2 + 1371^2 .

It is a cyclic number.

It is not a de Polignac number, because 15972157 - 2³ = 15972149 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15973157) 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, 7986078 + 7986079.

It is an arithmetic number, because the mean of its divisors is an integer number (7986079).

Almost surely, 2^15972157 is an apocalyptic number.

It is an amenable number.

15972157 is a deficient number, since it is larger than the sum of its proper divisors (1).

15972157 is an equidigital number, since it uses as much as digits as its factorization.

15972157 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 22050, while the sum is 37.

The square root of 15972157 is about 3996.5181095549. The cubic root of 15972157 is about 251.8379585204.

It can be divided in two parts, 15972 and 157, that added together give a square (16129 = 127²).

The spelling of 15972157 in words is "fifteen million, nine hundred seventy-two thousand, one hundred fifty-seven".