256323137 has 4 divisors (see below), whose sum is σ = 292940736. Its totient is φ = 219705540.

The previous prime is 256323121. The next prime is 256323149. The reversal of 256323137 is 731323652.

256323137 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 256323137 - 2⁴ = 256323121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256343137) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18308789 + ... + 18308802.

It is an arithmetic number, because the mean of its divisors is an integer number (73235184).

Almost surely, 2^256323137 is an apocalyptic number.

It is an amenable number.

256323137 is a deficient number, since it is larger than the sum of its proper divisors (36617599).

256323137 is an equidigital number, since it uses as much as digits as its factorization.

256323137 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36617598.

The product of its digits is 22680, while the sum is 32.

The square root of 256323137 is about 16010.0948466897. The cubic root of 256323137 is about 635.2274688818.

Adding to 256323137 its reverse (731323652), we get a palindrome (987646789).

The spelling of 256323137 in words is "two hundred fifty-six million, three hundred twenty-three thousand, one hundred thirty-seven".