31840131 has 16 divisors (see below), whose sum is σ = 44098560. Its totient is φ = 20412960.

The previous prime is 31840129. The next prime is 31840139. The reversal of 31840131 is 13104813.

It is not a de Polignac number, because 31840131 - 2¹ = 31840129 is a prime.

It is a super-2 number, since 2×31840131² = 2027587884194322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31840098 and 31840107.

It is not an unprimeable number, because it can be changed into a prime (31840139) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15100 + ... + 17078.

It is an arithmetic number, because the mean of its divisors is an integer number (2756160).

Almost surely, 2^31840131 is an apocalyptic number.

31840131 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

31840131 is a deficient number, since it is larger than the sum of its proper divisors (12258429).

31840131 is a wasteful number, since it uses less digits than its factorization.

31840131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2186.

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 31840131 is about 5642.7059997841. The cubic root of 31840131 is about 316.9506270400.

Adding to 31840131 its reverse (13104813), we get a palindrome (44944944).

The spelling of 31840131 in words is "thirty-one million, eight hundred forty thousand, one hundred thirty-one".