31011213113 has 4 divisors (see below), whose sum is σ = 31011575028. Its totient is φ = 31010851200.

The previous prime is 31011213073. The next prime is 31011213127. The reversal of 31011213113 is 31131211013.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 14068806544 + 16942406569 = 118612^2 + 130163^2 .

It is a cyclic number.

It is not a de Polignac number, because 31011213113 - 2⁶ = 31011213049 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 31011213091 and 31011213100.

It is not an unprimeable number, because it can be changed into a prime (31011213193) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28013 + ... + 250613.

It is an arithmetic number, because the mean of its divisors is an integer number (7752893757).

Almost surely, 2^31011213113 is an apocalyptic number.

It is an amenable number.

31011213113 is a deficient number, since it is larger than the sum of its proper divisors (361915).

31011213113 is a wasteful number, since it uses less digits than its factorization.

31011213113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 361914.

The product of its (nonzero) digits is 54, while the sum is 17.

Adding to 31011213113 its reverse (31131211013), we get a palindrome (62142424126).

The spelling of 31011213113 in words is "thirty-one billion, eleven million, two hundred thirteen thousand, one hundred thirteen".