256091269 has 16 divisors (see below), whose sum is σ = 308385792. Its totient is φ = 207911088.

The previous prime is 256091267. The next prime is 256091293. The reversal of 256091269 is 962190652.

It is not a de Polignac number, because 256091269 - 2¹ = 256091267 is a prime.

It is a super-2 number, since 2×256091269² = 131165476116060722, 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 (256091261) 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 15 ways as a sum of consecutive naturals, for example, 8862 + ... + 24304.

It is an arithmetic number, because the mean of its divisors is an integer number (19274112).

Almost surely, 2^256091269 is an apocalyptic number.

It is an amenable number.

256091269 is a deficient number, since it is larger than the sum of its proper divisors (52294523).

256091269 is a wasteful number, since it uses less digits than its factorization.

256091269 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15576.

The product of its (nonzero) digits is 58320, while the sum is 40.

The square root of 256091269 is about 16002.8519020830. The cubic root of 256091269 is about 635.0358704188.

The spelling of 256091269 in words is "two hundred fifty-six million, ninety-one thousand, two hundred sixty-nine".