31231132213 has 16 divisors (see below), whose sum is σ = 31774032576. Its totient is φ = 30693761280.

The previous prime is 31231132211. The next prime is 31231132279. The reversal of 31231132213 is 31223113213.

It is a cyclic number.

It is not a de Polignac number, because 31231132213 - 2¹ = 31231132211 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31231132211) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10128570 + ... + 10131652.

It is an arithmetic number, because the mean of its divisors is an integer number (1985877036).

Almost surely, 2^31231132213 is an apocalyptic number.

It is an amenable number.

31231132213 is a deficient number, since it is larger than the sum of its proper divisors (542900363).

31231132213 is a wasteful number, since it uses less digits than its factorization.

31231132213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3924.

The product of its digits is 648, while the sum is 22.

Adding to 31231132213 its reverse (31223113213), we get a palindrome (62454245426).

The spelling of 31231132213 in words is "thirty-one billion, two hundred thirty-one million, one hundred thirty-two thousand, two hundred thirteen".