31331013 has 8 divisors (see below), whose sum is σ = 47742528. Its totient is φ = 17903424.

The previous prime is 31330993. The next prime is 31331023. The reversal of 31331013 is 31013313.

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

It is not a de Polignac number, because 31331013 - 2¹⁰ = 31329989 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31330983 and 31331001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31331023) 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, 745956 + ... + 745997.

It is an arithmetic number, because the mean of its divisors is an integer number (5967816).

Almost surely, 2^31331013 is an apocalyptic number.

It is an amenable number.

31331013 is a deficient number, since it is larger than the sum of its proper divisors (16411515).

31331013 is a wasteful number, since it uses less digits than its factorization.

31331013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1491963.

The product of its (nonzero) digits is 81, while the sum is 15.

The square root of 31331013 is about 5597.4112766528. The cubic root of 31331013 is about 315.2522142289.

Adding to 31331013 its reverse (31013313), we get a palindrome (62344326).

The spelling of 31331013 in words is "thirty-one million, three hundred thirty-one thousand, thirteen".