256154117 has 2 divisors, whose sum is σ = 256154118. Its totient is φ = 256154116.

The previous prime is 256154081. The next prime is 256154131. The reversal of 256154117 is 711451652.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 181953121 + 74200996 = 13489^2 + 8614^2 .

It is a cyclic number.

It is not a de Polignac number, because 256154117 - 2¹² = 256150021 is a prime.

It is a super-2 number, since 2×256154117² = 131229863312099378, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256154167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128077058 + 128077059.

It is an arithmetic number, because the mean of its divisors is an integer number (128077059).

Almost surely, 2^256154117 is an apocalyptic number.

It is an amenable number.

256154117 is a deficient number, since it is larger than the sum of its proper divisors (1).

256154117 is an equidigital number, since it uses as much as digits as its factorization.

256154117 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8400, while the sum is 32.

The square root of 256154117 is about 16004.8154316131. The cubic root of 256154117 is about 635.0878147511.

The spelling of 256154117 in words is "two hundred fifty-six million, one hundred fifty-four thousand, one hundred seventeen".