31231212011 has 8 divisors (see below), whose sum is σ = 31293616704. Its totient is φ = 31168843200.

The previous prime is 31231211959. The next prime is 31231212037. The reversal of 31231212011 is 11021213213.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 31231212011 - 2²⁶ = 31164103147 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31231212041) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2308910 + ... + 2322396.

It is an arithmetic number, because the mean of its divisors is an integer number (3911702088).

Almost surely, 2^31231212011 is an apocalyptic number.

31231212011 is a deficient number, since it is larger than the sum of its proper divisors (62404693).

31231212011 is a wasteful number, since it uses less digits than its factorization.

31231212011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17941.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 31231212011 its reverse (11021213213), we get a palindrome (42252425224).

The spelling of 31231212011 in words is "thirty-one billion, two hundred thirty-one million, two hundred twelve thousand, eleven".