256955137 has 2 divisors, whose sum is σ = 256955138. Its totient is φ = 256955136.

The previous prime is 256955131. The next prime is 256955173. The reversal of 256955137 is 731559652.

Together with next prime (256955173) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 198218241 + 58736896 = 14079^2 + 7664^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-256955137 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 256955093 and 256955102.

It is not a weakly prime, because it can be changed into another prime (256955131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128477568 + 128477569.

It is an arithmetic number, because the mean of its divisors is an integer number (128477569).

Almost surely, 2^256955137 is an apocalyptic number.

It is an amenable number.

256955137 is a deficient number, since it is larger than the sum of its proper divisors (1).

256955137 is an equidigital number, since it uses as much as digits as its factorization.

256955137 is an evil number, because the sum of its binary digits is even.

The product of its digits is 283500, while the sum is 43.

The square root of 256955137 is about 16029.8202422859. The cubic root of 256955137 is about 635.7491206550.

The spelling of 256955137 in words is "two hundred fifty-six million, nine hundred fifty-five thousand, one hundred thirty-seven".