31311122011999 has 4 divisors (see below), whose sum is σ = 31315393076760. Its totient is φ = 31306850947240.

The previous prime is 31311122011921. The next prime is 31311122012029. The reversal of 31311122011999 is 99911022111313.

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 31311122011999 - 2²⁵ = 31311088457567 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31311122011909) 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, 2135521384 + ... + 2135536045.

It is an arithmetic number, because the mean of its divisors is an integer number (7828848269190).

Almost surely, 2^{31311122011999} is an apocalyptic number.

31311122011999 is a deficient number, since it is larger than the sum of its proper divisors (4271064761).

31311122011999 is an equidigital number, since it uses as much as digits as its factorization.

31311122011999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4271064760.

The product of its (nonzero) digits is 26244, while the sum is 43.

The spelling of 31311122011999 in words is "thirty-one trillion, three hundred eleven billion, one hundred twenty-two million, eleven thousand, nine hundred ninety-nine".