31312011 has 16 divisors (see below), whose sum is σ = 45149184. Its totient is φ = 19227264.

The previous prime is 31312007. The next prime is 31312033. The reversal of 31312011 is 11021313.

It is not a de Polignac number, because 31312011 - 2² = 31312007 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31312051) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4135 + ... + 8928.

It is an arithmetic number, because the mean of its divisors is an integer number (2821824).

Almost surely, 2^31312011 is an apocalyptic number.

31312011 is a deficient number, since it is larger than the sum of its proper divisors (13837173).

31312011 is a wasteful number, since it uses less digits than its factorization.

31312011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13130.

The product of its (nonzero) digits is 18, while the sum is 12.

The square root of 31312011 is about 5595.7136274116. The cubic root of 31312011 is about 315.1884687208.

Adding to 31312011 its reverse (11021313), we get a palindrome (42333324).

The spelling of 31312011 in words is "thirty-one million, three hundred twelve thousand, eleven".