1313928281 has 2 divisors, whose sum is σ = 1313928282. Its totient is φ = 1313928280.

The previous prime is 1313928277. The next prime is 1313928293. The reversal of 1313928281 is 1828293131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 858490000 + 455438281 = 29300^2 + 21341^2 .

It is a cyclic number.

It is not a de Polignac number, because 1313928281 - 2² = 1313928277 is a prime.

It is a super-2 number, since 2×1313928281² = 3452815055223229922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1313921281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 656964140 + 656964141.

It is an arithmetic number, because the mean of its divisors is an integer number (656964141).

Almost surely, 2^1313928281 is an apocalyptic number.

It is an amenable number.

1313928281 is a deficient number, since it is larger than the sum of its proper divisors (1).

1313928281 is an equidigital number, since it uses as much as digits as its factorization.

1313928281 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20736, while the sum is 38.

The square root of 1313928281 is about 36248.1486561728. The cubic root of 1313928281 is about 1095.2767955341.

The spelling of 1313928281 in words is "one billion, three hundred thirteen million, nine hundred twenty-eight thousand, two hundred eighty-one".