31113123011 has 2 divisors, whose sum is σ = 31113123012. Its totient is φ = 31113123010.

The previous prime is 31113123007. The next prime is 31113123073. The reversal of 31113123011 is 11032131113.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 31113123011 - 2² = 31113123007 is a prime.

It is a super-2 number, since 2×31113123011² (a number of 22 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (31113123211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15556561505 + 15556561506.

It is an arithmetic number, because the mean of its divisors is an integer number (15556561506).

Almost surely, 2^31113123011 is an apocalyptic number.

31113123011 is a deficient number, since it is larger than the sum of its proper divisors (1).

31113123011 is an equidigital number, since it uses as much as digits as its factorization.

31113123011 is an evil number, because the sum of its binary digits is even.

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

Adding to 31113123011 its reverse (11032131113), we get a palindrome (42145254124).

The spelling of 31113123011 in words is "thirty-one billion, one hundred thirteen million, one hundred twenty-three thousand, eleven".