128373257 has 2 divisors, whose sum is σ = 128373258. Its totient is φ = 128373256.

The previous prime is 128373221. The next prime is 128373269. The reversal of 128373257 is 752373821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 118613881 + 9759376 = 10891^2 + 3124^2 .

It is a cyclic number.

It is not a de Polignac number, because 128373257 - 2¹² = 128369161 is a prime.

It is a super-2 number, since 2×128373257² = 32959386225576098, which contains 22 as substring.

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 128373257.

It is not a weakly prime, because it can be changed into another prime (128373857) 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, 64186628 + 64186629.

It is an arithmetic number, because the mean of its divisors is an integer number (64186629).

Almost surely, 2^128373257 is an apocalyptic number.

It is an amenable number.

128373257 is a deficient number, since it is larger than the sum of its proper divisors (1).

128373257 is an equidigital number, since it uses as much as digits as its factorization.

128373257 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 70560, while the sum is 38.

The square root of 128373257 is about 11330.1922755088. The cubic root of 128373257 is about 504.4578136796.

The spelling of 128373257 in words is "one hundred twenty-eight million, three hundred seventy-three thousand, two hundred fifty-seven".