31011233213 has 8 divisors (see below), whose sum is σ = 33160528440. Its totient is φ = 28898060800.

The previous prime is 31011233117. The next prime is 31011233221. The reversal of 31011233213 is 31233211013.

It can be written as a sum of positive squares in 4 ways, for example, as 24268031524 + 6743201689 = 155782^2 + 82117^2 .

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 31011233213 - 2¹⁴ = 31011216829 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31011230213) 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, 9028928 + ... + 9032361.

It is an arithmetic number, because the mean of its divisors is an integer number (4145066055).

Almost surely, 2^31011233213 is an apocalyptic number.

It is an amenable number.

31011233213 is a deficient number, since it is larger than the sum of its proper divisors (2149295227).

31011233213 is a wasteful number, since it uses less digits than its factorization.

31011233213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18061407.

The product of its (nonzero) digits is 324, while the sum is 20.

Adding to 31011233213 its reverse (31233211013), we get a palindrome (62244444226).

The spelling of 31011233213 in words is "thirty-one billion, eleven million, two hundred thirty-three thousand, two hundred thirteen".