31311442011 has 4 divisors (see below), whose sum is σ = 41748589352. Its totient is φ = 20874294672.

The previous prime is 31311442009. The next prime is 31311442033. The reversal of 31311442011 is 11024411313.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 31311442011 - 2¹ = 31311442009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31311442091) 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, 5218573666 + ... + 5218573671.

It is an arithmetic number, because the mean of its divisors is an integer number (10437147338).

Almost surely, 2^31311442011 is an apocalyptic number.

31311442011 is a deficient number, since it is larger than the sum of its proper divisors (10437147341).

31311442011 is a wasteful number, since it uses less digits than its factorization.

31311442011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10437147340.

The product of its (nonzero) digits is 288, while the sum is 21.

Adding to 31311442011 its reverse (11024411313), we get a palindrome (42335853324).

The spelling of 31311442011 in words is "thirty-one billion, three hundred eleven million, four hundred forty-two thousand, eleven".