31323220013 has 8 divisors (see below), whose sum is σ = 34405368000. Its totient is φ = 28384427808.

The previous prime is 31323219989. The next prime is 31323220031. The reversal of 31323220013 is 31002232313.

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 31323220013 - 2²⁸ = 31054784557 is a prime.

It is a super-2 number, since 2×31323220013² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31323220063) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35838488 + ... + 35839361.

It is an arithmetic number, because the mean of its divisors is an integer number (4300671000).

Almost surely, 2^31323220013 is an apocalyptic number.

It is an amenable number.

31323220013 is a deficient number, since it is larger than the sum of its proper divisors (3082147987).

31323220013 is a wasteful number, since it uses less digits than its factorization.

31323220013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71677891.

The product of its (nonzero) digits is 648, while the sum is 20.

Adding to 31323220013 its reverse (31002232313), we get a palindrome (62325452326).

The spelling of 31323220013 in words is "thirty-one billion, three hundred twenty-three million, two hundred twenty thousand, thirteen".