1013391931 has 2 divisors, whose sum is σ = 1013391932. Its totient is φ = 1013391930.

The previous prime is 1013391887. The next prime is 1013391941. The reversal of 1013391931 is 1391933101.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1013391931 - 2⁹ = 1013391419 is a prime.

It is a super-2 number, since 2×1013391931² = 2053926411631817522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1013391893 and 1013391902.

It is not a weakly prime, because it can be changed into another prime (1013391941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 506695965 + 506695966.

It is an arithmetic number, because the mean of its divisors is an integer number (506695966).

Almost surely, 2^1013391931 is an apocalyptic number.

1013391931 is a deficient number, since it is larger than the sum of its proper divisors (1).

1013391931 is an equidigital number, since it uses as much as digits as its factorization.

1013391931 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2187, while the sum is 31.

The square root of 1013391931 is about 31833.8174116772. The cubic root of 1013391931 is about 1004.4441968554. Note that the first 3 decimals are identical.

The spelling of 1013391931 in words is "one billion, thirteen million, three hundred ninety-one thousand, nine hundred thirty-one".