256131777 has 16 divisors (see below), whose sum is σ = 372892608. Its totient is φ = 155090880.

The previous prime is 256131763. The next prime is 256131791. The reversal of 256131777 is 777131652.

It is an interprime number because it is at equal distance from previous prime (256131763) and next prime (256131791).

It is not a de Polignac number, because 256131777 - 2⁶ = 256131713 is a prime.

It is not an unprimeable number, because it can be changed into a prime (256133777) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42483 + ... + 48135.

It is an arithmetic number, because the mean of its divisors is an integer number (23305788).

Almost surely, 2^256131777 is an apocalyptic number.

It is an amenable number.

256131777 is a deficient number, since it is larger than the sum of its proper divisors (116760831).

256131777 is a wasteful number, since it uses less digits than its factorization.

256131777 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7040.

The product of its digits is 61740, while the sum is 39.

The square root of 256131777 is about 16004.1175014432. The cubic root of 256131777 is about 635.0693515509.

The spelling of 256131777 in words is "two hundred fifty-six million, one hundred thirty-one thousand, seven hundred seventy-seven".