256124431 has 4 divisors (see below), whose sum is σ = 271190592. Its totient is φ = 241058272.

The previous prime is 256124413. The next prime is 256124441. The reversal of 256124431 is 134421652.

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 256124431 - 2⁷ = 256124303 is a prime.

It is a super-2 number, since 2×256124431² = 131199448310147522, which contains 22 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 256124431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256124411) 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 3 ways as a sum of consecutive naturals, for example, 7533055 + ... + 7533088.

It is an arithmetic number, because the mean of its divisors is an integer number (67797648).

Almost surely, 2^256124431 is an apocalyptic number.

256124431 is a deficient number, since it is larger than the sum of its proper divisors (15066161).

256124431 is a wasteful number, since it uses less digits than its factorization.

256124431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15066160.

The product of its digits is 5760, while the sum is 28.

The square root of 256124431 is about 16003.8879963589. The cubic root of 256124431 is about 635.0632801136.

The spelling of 256124431 in words is "two hundred fifty-six million, one hundred twenty-four thousand, four hundred thirty-one".