31331131120213 has 4 divisors (see below), whose sum is σ = 31333494142080. Its totient is φ = 31328768098348.

The previous prime is 31331131120207. The next prime is 31331131120217. The reversal of 31331131120213 is 31202113113313.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 31331131120213 - 2⁵ = 31331131120181 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 (31331131120217) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1181491045 + ... + 1181517562.

It is an arithmetic number, because the mean of its divisors is an integer number (7833373535520).

Almost surely, 2^{31331131120213} is an apocalyptic number.

It is an amenable number.

31331131120213 is a deficient number, since it is larger than the sum of its proper divisors (2363021867).

31331131120213 is a wasteful number, since it uses less digits than its factorization.

31331131120213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2363021866.

The product of its (nonzero) digits is 972, while the sum is 25.

Adding to 31331131120213 its reverse (31202113113313), we get a palindrome (62533244233526).

The spelling of 31331131120213 in words is "thirty-one trillion, three hundred thirty-one billion, one hundred thirty-one million, one hundred twenty thousand, two hundred thirteen".