256178951 has 4 divisors (see below), whose sum is σ = 292775952. Its totient is φ = 219581952.

The previous prime is 256178929. The next prime is 256178969. The reversal of 256178951 is 159871652.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 256178951 - 2¹⁰ = 256177927 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256178911) 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, 18298490 + ... + 18298503.

It is an arithmetic number, because the mean of its divisors is an integer number (73193988).

Almost surely, 2^256178951 is an apocalyptic number.

256178951 is a deficient number, since it is larger than the sum of its proper divisors (36597001).

256178951 is an equidigital number, since it uses as much as digits as its factorization.

256178951 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36597000.

The product of its digits is 151200, while the sum is 44.

The square root of 256178951 is about 16005.5912418130. The cubic root of 256178951 is about 635.1083378920.

The spelling of 256178951 in words is "two hundred fifty-six million, one hundred seventy-eight thousand, nine hundred fifty-one".