31231311011 has 4 divisors (see below), whose sum is σ = 32308252800. Its totient is φ = 30154369224.

The previous prime is 31231310969. The next prime is 31231311043. The reversal of 31231311011 is 11011313213.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11011313213 = 137 ⋅80374549.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31231311011 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31231311511) 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, 538470851 + ... + 538470908.

It is an arithmetic number, because the mean of its divisors is an integer number (8077063200).

Almost surely, 2^31231311011 is an apocalyptic number.

31231311011 is a deficient number, since it is larger than the sum of its proper divisors (1076941789).

31231311011 is a wasteful number, since it uses less digits than its factorization.

31231311011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1076941788.

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

Adding to 31231311011 its reverse (11011313213), we get a palindrome (42242624224).

The spelling of 31231311011 in words is "thirty-one billion, two hundred thirty-one million, three hundred eleven thousand, eleven".