1391226913 has 2 divisors, whose sum is σ = 1391226914. Its totient is φ = 1391226912.

The previous prime is 1391226901. The next prime is 1391226989. The reversal of 1391226913 is 3196221931.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1389201984 + 2024929 = 37272^2 + 1423^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1391226913 is a prime.

It is not a weakly prime, because it can be changed into another prime (1391226413) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 695613456 + 695613457.

It is an arithmetic number, because the mean of its divisors is an integer number (695613457).

Almost surely, 2^1391226913 is an apocalyptic number.

It is an amenable number.

1391226913 is a deficient number, since it is larger than the sum of its proper divisors (1).

1391226913 is an equidigital number, since it uses as much as digits as its factorization.

1391226913 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17496, while the sum is 37.

The square root of 1391226913 is about 37299.1543201719. The cubic root of 1391226913 is about 1116.3472926512.

The spelling of 1391226913 in words is "one billion, three hundred ninety-one million, two hundred twenty-six thousand, nine hundred thirteen".