256351551 has 8 divisors (see below), whose sum is σ = 361908144. Its totient is φ = 160848000.

The previous prime is 256351549. The next prime is 256351609. The reversal of 256351551 is 155153652.

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

It is not a de Polignac number, because 256351551 - 2¹ = 256351549 is a prime.

It is a super-2 number, since 2×256351551² = 131432235400211202, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256351451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2513200 + ... + 2513301.

It is an arithmetic number, because the mean of its divisors is an integer number (45238518).

Almost surely, 2^256351551 is an apocalyptic number.

256351551 is a deficient number, since it is larger than the sum of its proper divisors (105556593).

256351551 is a wasteful number, since it uses less digits than its factorization.

256351551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5026521.

The product of its digits is 22500, while the sum is 33.

The square root of 256351551 is about 16010.9821997278. The cubic root of 256351551 is about 635.2509401488.

The spelling of 256351551 in words is "two hundred fifty-six million, three hundred fifty-one thousand, five hundred fifty-one".