256798151 has 4 divisors (see below), whose sum is σ = 267963312. Its totient is φ = 245632992.

The previous prime is 256798109. The next prime is 256798153. The reversal of 256798151 is 151897652.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-256798151 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256798153) 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, 5582546 + ... + 5582591.

It is an arithmetic number, because the mean of its divisors is an integer number (66990828).

Almost surely, 2^256798151 is an apocalyptic number.

256798151 is a deficient number, since it is larger than the sum of its proper divisors (11165161).

256798151 is a wasteful number, since it uses less digits than its factorization.

256798151 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11165160.

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

The square root of 256798151 is about 16024.9228079264. The cubic root of 256798151 is about 635.6196245823.

The spelling of 256798151 in words is "two hundred fifty-six million, seven hundred ninety-eight thousand, one hundred fifty-one".