31231032011 has 4 divisors (see below), whose sum is σ = 32588902992. Its totient is φ = 29873161032.

The previous prime is 31231031999. The next prime is 31231032071. The reversal of 31231032011 is 11023013213.

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

It is a cyclic number.

It is not a de Polignac number, because 31231032011 - 2³⁰ = 30157290187 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31231032071) 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, 678935456 + ... + 678935501.

It is an arithmetic number, because the mean of its divisors is an integer number (8147225748).

Almost surely, 2^31231032011 is an apocalyptic number.

31231032011 is a deficient number, since it is larger than the sum of its proper divisors (1357870981).

31231032011 is a wasteful number, since it uses less digits than its factorization.

31231032011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1357870980.

The product of its (nonzero) digits is 108, while the sum is 17.

Adding to 31231032011 its reverse (11023013213), we get a palindrome (42254045224).

The spelling of 31231032011 in words is "thirty-one billion, two hundred thirty-one million, thirty-two thousand, eleven".