31812013 has 8 divisors (see below), whose sum is σ = 33651648. Its totient is φ = 30010464.

The previous prime is 31811999. The next prime is 31812019. The reversal of 31812013 is 31021813.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31812013 is a prime.

It is a super-2 number, since 2×31812013² = 2024008342224338, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31812019) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7795 + ... + 11152.

It is an arithmetic number, because the mean of its divisors is an integer number (4206456).

Almost surely, 2^31812013 is an apocalyptic number.

It is an amenable number.

31812013 is a deficient number, since it is larger than the sum of its proper divisors (1839635).

31812013 is a wasteful number, since it uses less digits than its factorization.

31812013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19043.

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 31812013 is about 5640.2139143830. The cubic root of 31812013 is about 316.8572999280.

Adding to 31812013 its reverse (31021813), we get a palindrome (62833826).

The spelling of 31812013 in words is "thirty-one million, eight hundred twelve thousand, thirteen".