256603400531 has 2 divisors, whose sum is σ = 256603400532. Its totient is φ = 256603400530.

The previous prime is 256603400483. The next prime is 256603400609. The reversal of 256603400531 is 135004306652.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 256603400531 - 2¹⁸ = 256603138387 is a prime.

It is a super-2 number, since 2×256603400531² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 256603400491 and 256603400500.

It is not a weakly prime, because it can be changed into another prime (256603400231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128301700265 + 128301700266.

It is an arithmetic number, because the mean of its divisors is an integer number (128301700266).

Almost surely, 2^256603400531 is an apocalyptic number.

256603400531 is a deficient number, since it is larger than the sum of its proper divisors (1).

256603400531 is an equidigital number, since it uses as much as digits as its factorization.

256603400531 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64800, while the sum is 35.

The spelling of 256603400531 in words is "two hundred fifty-six billion, six hundred three million, four hundred thousand, five hundred thirty-one".