1031115813 has 32 divisors (see below), whose sum is σ = 1702176000. Its totient is φ = 543860928.

The previous prime is 1031115809. The next prime is 1031115857. The reversal of 1031115813 is 3185111301.

It is not a de Polignac number, because 1031115813 - 2² = 1031115809 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1031215813) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 34963 + ... + 57311.

It is an arithmetic number, because the mean of its divisors is an integer number (53193000).

Almost surely, 2^1031115813 is an apocalyptic number.

1031115813 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

1031115813 is a deficient number, since it is larger than the sum of its proper divisors (671060187).

1031115813 is an equidigital number, since it uses as much as digits as its factorization.

1031115813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22398 (or 22372 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 24.

The square root of 1031115813 is about 32110.9920899371. The cubic root of 1031115813 is about 1010.2661824972.

The spelling of 1031115813 in words is "one billion, thirty-one million, one hundred fifteen thousand, eight hundred thirteen".