256151731 has 8 divisors (see below), whose sum is σ = 285937344. Its totient is φ = 227449320.

The previous prime is 256151717. The next prime is 256151737. The reversal of 256151731 is 137151652.

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

It is a cyclic number.

It is not a de Polignac number, because 256151731 - 2⁷ = 256151603 is a prime.

It is a super-2 number, since 2×256151731² = 131227418588592722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 256151693 and 256151702.

It is not an unprimeable number, because it can be changed into a prime (256151737) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 270301 + ... + 271246.

It is an arithmetic number, because the mean of its divisors is an integer number (35742168).

Almost surely, 2^256151731 is an apocalyptic number.

256151731 is a deficient number, since it is larger than the sum of its proper divisors (29785613).

256151731 is a wasteful number, since it uses less digits than its factorization.

256151731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 541601.

The product of its digits is 6300, while the sum is 31.

The square root of 256151731 is about 16004.7408913734. The cubic root of 256151731 is about 635.0858428598.

The spelling of 256151731 in words is "two hundred fifty-six million, one hundred fifty-one thousand, seven hundred thirty-one".