31013131 has 8 divisors (see below), whose sum is σ = 32697504. Its totient is φ = 29356800.

The previous prime is 31013089. The next prime is 31013137. The reversal of 31013131 is 13131013.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 31013131 - 2¹⁵ = 30980363 is a prime.

It is a super-2 number, since 2×31013131² = 1923628588846322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31013137) 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 in 7 ways as a sum of consecutive naturals, for example, 4720 + ... + 9181.

It is an arithmetic number, because the mean of its divisors is an integer number (4087188).

Almost surely, 2^31013131 is an apocalyptic number.

31013131 is a deficient number, since it is larger than the sum of its proper divisors (1684373).

31013131 is a wasteful number, since it uses less digits than its factorization.

31013131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14021.

The product of its (nonzero) digits is 27, while the sum is 13.

The square root of 31013131 is about 5568.9434365955. The cubic root of 31013131 is about 314.1824132462.

Adding to 31013131 its reverse (13131013), we get a palindrome (44144144).

The spelling of 31013131 in words is "thirty-one million, thirteen thousand, one hundred thirty-one".