15128857 has 2 divisors, whose sum is σ = 15128858. Its totient is φ = 15128856.

The previous prime is 15128809. The next prime is 15128881. The reversal of 15128857 is 75882151.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13808656 + 1320201 = 3716^2 + 1149^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15128857 is a prime.

It is a Chen prime.

It is equal to p₉₇₈₄₉₀ and since 15128857 and 978490 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (15128887) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7564428 + 7564429.

It is an arithmetic number, because the mean of its divisors is an integer number (7564429).

Almost surely, 2^15128857 is an apocalyptic number.

It is an amenable number.

15128857 is a deficient number, since it is larger than the sum of its proper divisors (1).

15128857 is an equidigital number, since it uses as much as digits as its factorization.

15128857 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 22400, while the sum is 37.

The square root of 15128857 is about 3889.5831396179. The cubic root of 15128857 is about 247.3253919287.

The spelling of 15128857 in words is "fifteen million, one hundred twenty-eight thousand, eight hundred fifty-seven".