256014131521 has 2 divisors, whose sum is σ = 256014131522. Its totient is φ = 256014131520.

The previous prime is 256014131519. The next prime is 256014131537. The reversal of 256014131521 is 125131410652.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 159591461121 + 96422670400 = 399489^2 + 310520^2 .

It is a cyclic number.

It is not a de Polignac number, because 256014131521 - 2¹ = 256014131519 is a prime.

Together with 256014131519, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (256014137521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128007065760 + 128007065761.

It is an arithmetic number, because the mean of its divisors is an integer number (128007065761).

Almost surely, 2^256014131521 is an apocalyptic number.

It is an amenable number.

256014131521 is a deficient number, since it is larger than the sum of its proper divisors (1).

256014131521 is an equidigital number, since it uses as much as digits as its factorization.

256014131521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7200, while the sum is 31.

The spelling of 256014131521 in words is "two hundred fifty-six billion, fourteen million, one hundred thirty-one thousand, five hundred twenty-one".