256731167 has 8 divisors (see below), whose sum is σ = 320080512. Its totient is φ = 200050200.

The previous prime is 256731157. The next prime is 256731169. The reversal of 256731167 is 761137652.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 256731167 - 2⁶ = 256731103 is a prime.

It is a super-3 number, since 3×256731167³ (a number of 26 digits) contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 256731167.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256731169) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1667009 + ... + 1667162.

It is an arithmetic number, because the mean of its divisors is an integer number (40010064).

Almost surely, 2^256731167 is an apocalyptic number.

256731167 is a deficient number, since it is larger than the sum of its proper divisors (63349345).

256731167 is a wasteful number, since it uses less digits than its factorization.

256731167 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3334189.

The product of its digits is 52920, while the sum is 38.

The square root of 256731167 is about 16022.8326771517. The cubic root of 256731167 is about 635.5643541333.

The spelling of 256731167 in words is "two hundred fifty-six million, seven hundred thirty-one thousand, one hundred sixty-seven".