31319764109 has 4 divisors (see below), whose sum is σ = 31322077440. Its totient is φ = 31317450780.

The previous prime is 31319764097. The next prime is 31319764123. The reversal of 31319764109 is 90146791313.

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 a de Polignac number, because none of the positive numbers 2^k-31319764109 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 31319764109.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31319764159) 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, 1136237 + ... + 1163474.

It is an arithmetic number, because the mean of its divisors is an integer number (7830519360).

Almost surely, 2^31319764109 is an apocalyptic number.

It is an amenable number.

31319764109 is a deficient number, since it is larger than the sum of its proper divisors (2313331).

31319764109 is a wasteful number, since it uses less digits than its factorization.

31319764109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2313330.

The product of its (nonzero) digits is 122472, while the sum is 44.

The spelling of 31319764109 in words is "thirty-one billion, three hundred nineteen million, seven hundred sixty-four thousand, one hundred nine".