256265831 has 4 divisors (see below), whose sum is σ = 256555632. Its totient is φ = 255976032.

The previous prime is 256265797. The next prime is 256265857. The reversal of 256265831 is 138562652.

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 256265831 - 2¹⁰ = 256264807 is a prime.

It is a super-2 number, since 2×256265831² = 131344352276241122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256265881) 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, 143570 + ... + 145343.

It is an arithmetic number, because the mean of its divisors is an integer number (64138908).

Almost surely, 2^256265831 is an apocalyptic number.

256265831 is a deficient number, since it is larger than the sum of its proper divisors (289801).

256265831 is an equidigital number, since it uses as much as digits as its factorization.

256265831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 289800.

The product of its digits is 86400, while the sum is 38.

The square root of 256265831 is about 16008.3050633101. The cubic root of 256265831 is about 635.1801262203.

The spelling of 256265831 in words is "two hundred fifty-six million, two hundred sixty-five thousand, eight hundred thirty-one".