256151501 has 2 divisors, whose sum is σ = 256151502. Its totient is φ = 256151500.

The previous prime is 256151471. The next prime is 256151513. The reversal of 256151501 is 105151652.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 133518025 + 122633476 = 11555^2 + 11074^2 .

It is a cyclic number.

It is not a de Polignac number, because 256151501 - 2¹⁸ = 255889357 is a prime.

It is a super-2 number, since 2×256151501² = 131227182929106002, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256151591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128075750 + 128075751.

It is an arithmetic number, because the mean of its divisors is an integer number (128075751).

Almost surely, 2^256151501 is an apocalyptic number.

It is an amenable number.

256151501 is a deficient number, since it is larger than the sum of its proper divisors (1).

256151501 is an equidigital number, since it uses as much as digits as its factorization.

256151501 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1500, while the sum is 26.

The square root of 256151501 is about 16004.7337060009. The cubic root of 256151501 is about 635.0856527774.

It can be divided in two parts, 256151 and 501, that added together give a palindrome (256652).

The spelling of 256151501 in words is "two hundred fifty-six million, one hundred fifty-one thousand, five hundred one".