1313026381 has 2 divisors, whose sum is σ = 1313026382. Its totient is φ = 1313026380.

The previous prime is 1313026367. The next prime is 1313026423. The reversal of 1313026381 is 1836203131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1016015625 + 297010756 = 31875^2 + 17234^2 .

It is a cyclic number.

It is not a de Polignac number, because 1313026381 - 2¹¹ = 1313024333 is a prime.

It is a super-2 number, since 2×1313026381² = 3448076554403914322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1313024381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 656513190 + 656513191.

It is an arithmetic number, because the mean of its divisors is an integer number (656513191).

Almost surely, 2^1313026381 is an apocalyptic number.

It is an amenable number.

1313026381 is a deficient number, since it is larger than the sum of its proper divisors (1).

1313026381 is an equidigital number, since it uses as much as digits as its factorization.

1313026381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 1313026381 is about 36235.7058852177. The cubic root of 1313026381 is about 1095.0261333880.

The spelling of 1313026381 in words is "one billion, three hundred thirteen million, twenty-six thousand, three hundred eighty-one".