31309296493 has 4 divisors (see below), whose sum is σ = 31322382588. Its totient is φ = 31296210400.

The previous prime is 31309296449. The next prime is 31309296569. The reversal of 31309296493 is 39469290313.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 39469290313 = 56003 ⋅704771.

It can be written as a sum of positive squares in 2 ways, for example, as 8599409289 + 22709887204 = 92733^2 + 150698^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31309296493 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 (31309296793) 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, 6539458 + ... + 6544243.

It is an arithmetic number, because the mean of its divisors is an integer number (7830595647).

Almost surely, 2^31309296493 is an apocalyptic number.

It is an amenable number.

31309296493 is a deficient number, since it is larger than the sum of its proper divisors (13086095).

31309296493 is a wasteful number, since it uses less digits than its factorization.

31309296493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13086094.

The product of its (nonzero) digits is 944784, while the sum is 49.

The spelling of 31309296493 in words is "thirty-one billion, three hundred nine million, two hundred ninety-six thousand, four hundred ninety-three".