256117069 has 12 divisors (see below), whose sum is σ = 279724116. Its totient is φ = 233114112.

The previous prime is 256117051. The next prime is 256117109. The reversal of 256117069 is 960711652.

It can be written as a sum of positive squares in 6 ways, for example, as 33212169 + 222904900 = 5763^2 + 14930^2 .

It is not a de Polignac number, because 256117069 - 2²¹ = 254019917 is a prime.

It is a super-2 number, since 2×256117069² = 131191906066301522, 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 (256117039) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 67429 + ... + 71125.

It is an arithmetic number, because the mean of its divisors is an integer number (23310343).

Almost surely, 2^256117069 is an apocalyptic number.

It is an amenable number.

256117069 is a deficient number, since it is larger than the sum of its proper divisors (23607047).

256117069 is an equidigital number, since it uses as much as digits as its factorization.

256117069 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3856 (or 3783 counting only the distinct ones).

The product of its (nonzero) digits is 22680, while the sum is 37.

The square root of 256117069 is about 16003.6579880976. The cubic root of 256117069 is about 635.0571953359.

The spelling of 256117069 in words is "two hundred fifty-six million, one hundred seventeen thousand, sixty-nine".