31331311109 has 4 divisors (see below), whose sum is σ = 35807212704. Its totient is φ = 26855409516.

The previous prime is 31331311097. The next prime is 31331311153. The reversal of 31331311109 is 90111313313.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 31331311109 - 2²⁰ = 31330262533 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 (31331311169) 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, 2237950787 + ... + 2237950800.

It is an arithmetic number, because the mean of its divisors is an integer number (8951803176).

Almost surely, 2^31331311109 is an apocalyptic number.

It is an amenable number.

31331311109 is a deficient number, since it is larger than the sum of its proper divisors (4475901595).

31331311109 is an equidigital number, since it uses as much as digits as its factorization.

31331311109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4475901594.

The product of its (nonzero) digits is 729, while the sum is 26.

The spelling of 31331311109 in words is "thirty-one billion, three hundred thirty-one million, three hundred eleven thousand, one hundred nine".