256111477 has 4 divisors (see below), whose sum is σ = 271176876. Its totient is φ = 241046080.

The previous prime is 256111459. The next prime is 256111487. The reversal of 256111477 is 774111652.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 80442961 + 175668516 = 8969^2 + 13254^2 .

It is a cyclic number.

It is not a de Polignac number, because 256111477 - 2¹⁵ = 256078709 is a prime.

It is a super-2 number, since 2×256111477² = 131186177302243058, 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 (256111487) 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, 7532674 + ... + 7532707.

It is an arithmetic number, because the mean of its divisors is an integer number (67794219).

Almost surely, 2^256111477 is an apocalyptic number.

It is an amenable number.

256111477 is a deficient number, since it is larger than the sum of its proper divisors (15065399).

256111477 is a wasteful number, since it uses less digits than its factorization.

256111477 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15065398.

The product of its digits is 11760, while the sum is 34.

The square root of 256111477 is about 16003.4832770869. The cubic root of 256111477 is about 635.0525734057.

The spelling of 256111477 in words is "two hundred fifty-six million, one hundred eleven thousand, four hundred seventy-seven".