256553501 has 2 divisors, whose sum is σ = 256553502. Its totient is φ = 256553500.

The previous prime is 256553491. The next prime is 256553567. The reversal of 256553501 is 105355652.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 223502500 + 33051001 = 14950^2 + 5749^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-256553501 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256552501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128276750 + 128276751.

It is an arithmetic number, because the mean of its divisors is an integer number (128276751).

Almost surely, 2^256553501 is an apocalyptic number.

It is an amenable number.

256553501 is a deficient number, since it is larger than the sum of its proper divisors (1).

256553501 is an equidigital number, since it uses as much as digits as its factorization.

256553501 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 22500, while the sum is 32.

The square root of 256553501 is about 16017.2875668760. The cubic root of 256553501 is about 635.4177101613.

The spelling of 256553501 in words is "two hundred fifty-six million, five hundred fifty-three thousand, five hundred one".