131031631 has 8 divisors (see below), whose sum is σ = 138841344. Its totient is φ = 123233280.

The previous prime is 131031623. The next prime is 131031647. The reversal of 131031631 is 136130131.

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 131031631 - 2³ = 131031623 is a prime.

It is a super-2 number, since 2×131031631² = 34338576645040322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 131031599 and 131031608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131031601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36946 + ... + 40336.

It is an arithmetic number, because the mean of its divisors is an integer number (17355168).

Almost surely, 2^131031631 is an apocalyptic number.

131031631 is a deficient number, since it is larger than the sum of its proper divisors (7809713).

131031631 is a wasteful number, since it uses less digits than its factorization.

131031631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5681.

The product of its (nonzero) digits is 162, while the sum is 19.

The square root of 131031631 is about 11446.9048655084. The cubic root of 131031631 is about 507.9161813783.

Adding to 131031631 its reverse (136130131), we get a palindrome (267161762).

The spelling of 131031631 in words is "one hundred thirty-one million, thirty-one thousand, six hundred thirty-one".