256756501 has 2 divisors, whose sum is σ = 256756502. Its totient is φ = 256756500.

The previous prime is 256756499. The next prime is 256756523. The reversal of 256756501 is 105657652.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 238702500 + 18054001 = 15450^2 + 4249^2 .

It is a cyclic number.

It is not a de Polignac number, because 256756501 - 2¹ = 256756499 is a prime.

Together with 256756499, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256756531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128378250 + 128378251.

It is an arithmetic number, because the mean of its divisors is an integer number (128378251).

Almost surely, 2^256756501 is an apocalyptic number.

It is an amenable number.

256756501 is a deficient number, since it is larger than the sum of its proper divisors (1).

256756501 is an equidigital number, since it uses as much as digits as its factorization.

256756501 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 63000, while the sum is 37.

The square root of 256756501 is about 16023.6232169881. The cubic root of 256756501 is about 635.5852590847.

The spelling of 256756501 in words is "two hundred fifty-six million, seven hundred fifty-six thousand, five hundred one".