256137023 has 2 divisors, whose sum is σ = 256137024. Its totient is φ = 256137022.

The previous prime is 256136999. The next prime is 256137041. The reversal of 256137023 is 320731652.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 256137023 - 2¹² = 256132927 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256137083) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128068511 + 128068512.

It is an arithmetic number, because the mean of its divisors is an integer number (128068512).

Almost surely, 2^256137023 is an apocalyptic number.

256137023 is a deficient number, since it is larger than the sum of its proper divisors (1).

256137023 is an equidigital number, since it uses as much as digits as its factorization.

256137023 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7560, while the sum is 29.

The square root of 256137023 is about 16004.2813959265. The cubic root of 256137023 is about 635.0736872762.

Adding to 256137023 its reverse (320731652), we get a palindrome (576868675).

The spelling of 256137023 in words is "two hundred fifty-six million, one hundred thirty-seven thousand, twenty-three".