31320031309 has 16 divisors (see below), whose sum is σ = 35908323840. Its totient is φ = 26760378240.

The previous prime is 31320031297. The next prime is 31320031331. The reversal of 31320031309 is 90313002313.

It is a cyclic number.

It is not a de Polignac number, because 31320031309 - 2³¹ = 29172547661 is a prime.

It is a super-2 number, since 2×31320031309² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31320031399) 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, 3058572 + ... + 3068794.

It is an arithmetic number, because the mean of its divisors is an integer number (2244270240).

Almost surely, 2^31320031309 is an apocalyptic number.

It is an amenable number.

31320031309 is a deficient number, since it is larger than the sum of its proper divisors (4588292531).

31320031309 is a wasteful number, since it uses less digits than its factorization.

31320031309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11580.

The product of its (nonzero) digits is 1458, while the sum is 25.

The spelling of 31320031309 in words is "thirty-one billion, three hundred twenty million, thirty-one thousand, three hundred nine".