256423501 has 2 divisors, whose sum is σ = 256423502. Its totient is φ = 256423500.

The previous prime is 256423483. The next prime is 256423561. The reversal of 256423501 is 105324652.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 249798025 + 6625476 = 15805^2 + 2574^2 .

It is a cyclic number.

It is not a de Polignac number, because 256423501 - 2⁵ = 256423469 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 256423501.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256423561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128211750 + 128211751.

It is an arithmetic number, because the mean of its divisors is an integer number (128211751).

Almost surely, 2^256423501 is an apocalyptic number.

It is an amenable number.

256423501 is a deficient number, since it is larger than the sum of its proper divisors (1).

256423501 is an equidigital number, since it uses as much as digits as its factorization.

256423501 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7200, while the sum is 28.

The square root of 256423501 is about 16013.2289373505. The cubic root of 256423501 is about 635.3103663931.

The spelling of 256423501 in words is "two hundred fifty-six million, four hundred twenty-three thousand, five hundred one".