31013081 has 4 divisors (see below), whose sum is σ = 33832464. Its totient is φ = 28193700.

The previous prime is 31013077. The next prime is 31013089. The reversal of 31013081 is 18031013.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 31013081 - 2² = 31013077 is a prime.

It is a super-2 number, since 2×31013081² = 1923622386225122, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (31013089) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1409675 + ... + 1409696.

It is an arithmetic number, because the mean of its divisors is an integer number (8458116).

Almost surely, 2^31013081 is an apocalyptic number.

It is an amenable number.

31013081 is a deficient number, since it is larger than the sum of its proper divisors (2819383).

31013081 is a wasteful number, since it uses less digits than its factorization.

31013081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2819382.

The product of its (nonzero) digits is 72, while the sum is 17.

The square root of 31013081 is about 5568.9389474118. The cubic root of 31013081 is about 314.1822444023.

Adding to 31013081 its reverse (18031013), we get a palindrome (49044094).

The spelling of 31013081 in words is "thirty-one million, thirteen thousand, eighty-one".