256322137 has 4 divisors (see below), whose sum is σ = 260666640. Its totient is φ = 251977636.

The previous prime is 256322117. The next prime is 256322153. The reversal of 256322137 is 731223652.

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 256322137 - 2⁷ = 256322009 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 256322099 and 256322108.

It is not an unprimeable number, because it can be changed into a prime (256322117) 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, 2172163 + ... + 2172280.

It is an arithmetic number, because the mean of its divisors is an integer number (65166660).

Almost surely, 2^256322137 is an apocalyptic number.

It is an amenable number.

256322137 is a deficient number, since it is larger than the sum of its proper divisors (4344503).

256322137 is an equidigital number, since it uses as much as digits as its factorization.

256322137 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4344502.

The product of its digits is 15120, while the sum is 31.

The square root of 256322137 is about 16010.0636163633. The cubic root of 256322137 is about 635.2266428043.

Adding to 256322137 its reverse (731223652), we get a palindrome (987545789).

The spelling of 256322137 in words is "two hundred fifty-six million, three hundred twenty-two thousand, one hundred thirty-seven".