31400131 has 12 divisors (see below), whose sum is σ = 36692040. Its totient is φ = 26792640.

The previous prime is 31400123. The next prime is 31400143. The reversal of 31400131 is 13100413.

It is not a de Polignac number, because 31400131 - 2³ = 31400123 is a prime.

It is a super-2 number, since 2×31400131² = 1971936453634322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31400231) 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 11 ways as a sum of consecutive naturals, for example, 10480 + ... + 13138.

It is an arithmetic number, because the mean of its divisors is an integer number (3057670).

Almost surely, 2^31400131 is an apocalyptic number.

31400131 is a deficient number, since it is larger than the sum of its proper divisors (5291909).

31400131 is a wasteful number, since it uses less digits than its factorization.

31400131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2914 (or 2907 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 31400131 is about 5603.5819794128. The cubic root of 31400131 is about 315.4838654166.

Adding to 31400131 its reverse (13100413), we get a palindrome (44500544).

The spelling of 31400131 in words is "thirty-one million, four hundred thousand, one hundred thirty-one".