256603453 has 2 divisors, whose sum is σ = 256603454. Its totient is φ = 256603452.

The previous prime is 256603439. The next prime is 256603471. The reversal of 256603453 is 354306652.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 135559449 + 121044004 = 11643^2 + 11002^2 .

It is a cyclic number.

It is not a de Polignac number, because 256603453 - 2⁵ = 256603421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256603483) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128301726 + 128301727.

It is an arithmetic number, because the mean of its divisors is an integer number (128301727).

Almost surely, 2^256603453 is an apocalyptic number.

It is an amenable number.

256603453 is a deficient number, since it is larger than the sum of its proper divisors (1).

256603453 is an equidigital number, since it uses as much as digits as its factorization.

256603453 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64800, while the sum is 34.

The square root of 256603453 is about 16018.8468061843. The cubic root of 256603453 is about 635.4589469476.

The spelling of 256603453 in words is "two hundred fifty-six million, six hundred three thousand, four hundred fifty-three".