31113131 has 8 divisors (see below), whose sum is σ = 35986944. Its totient is φ = 26346600.

The previous prime is 31113113. The next prime is 31113167. The reversal of 31113131 is 13131113.

It is a happy number.

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

It is not a de Polignac number, because 31113131 - 2¹⁸ = 30850987 is a prime.

It is a super-2 number, since 2×31113131² = 1936053841246322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (31113631) 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, 26195 + ... + 27356.

It is an arithmetic number, because the mean of its divisors is an integer number (4498368).

Almost surely, 2^31113131 is an apocalyptic number.

31113131 is a deficient number, since it is larger than the sum of its proper divisors (4873813).

31113131 is an equidigital number, since it uses as much as digits as its factorization.

31113131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53641.

The product of its digits is 27, while the sum is 14.

The square root of 31113131 is about 5577.9145744624. The cubic root of 31113131 is about 314.5197384578.

Adding to 31113131 its reverse (13131113), we get a palindrome (44244244).

The spelling of 31113131 in words is "thirty-one million, one hundred thirteen thousand, one hundred thirty-one".