1256322132979 has 2 divisors, whose sum is σ = 1256322132980. Its totient is φ = 1256322132978.

The previous prime is 1256322132977. The next prime is 1256322133021. The reversal of 1256322132979 is 9792312236521.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1256322132979 - 2¹ = 1256322132977 is a prime.

Together with 1256322132977, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1256322132977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 628161066489 + 628161066490.

It is an arithmetic number, because the mean of its divisors is an integer number (628161066490).

Almost surely, 2^{1256322132979} is an apocalyptic number.

1256322132979 is a deficient number, since it is larger than the sum of its proper divisors (1).

1256322132979 is an equidigital number, since it uses as much as digits as its factorization.

1256322132979 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2449440, while the sum is 52.

The spelling of 1256322132979 in words is "one trillion, two hundred fifty-six billion, three hundred twenty-two million, one hundred thirty-two thousand, nine hundred seventy-nine".