31130531 has 8 divisors (see below), whose sum is σ = 32939280. Its totient is φ = 29338848.

The previous prime is 31130527. The next prime is 31130549. The reversal of 31130531 is 13503113.

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 31130531 - 2² = 31130527 is a prime.

It is a super-2 number, since 2×31130531² = 1938219920683922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31130551) 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, 416 + ... + 7901.

It is an arithmetic number, because the mean of its divisors is an integer number (4117410).

Almost surely, 2^31130531 is an apocalyptic number.

31130531 is a deficient number, since it is larger than the sum of its proper divisors (1808749).

31130531 is a wasteful number, since it uses less digits than its factorization.

31130531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8533.

The product of its (nonzero) digits is 135, while the sum is 17.

The square root of 31130531 is about 5579.4740791584. The cubic root of 31130531 is about 314.5783591902.

Adding to 31130531 its reverse (13503113), we get a palindrome (44633644).

The spelling of 31130531 in words is "thirty-one million, one hundred thirty thousand, five hundred thirty-one".