31309300493 has 4 divisors (see below), whose sum is σ = 31312003548. Its totient is φ = 31306597440.

The previous prime is 31309300489. The next prime is 31309300553. The reversal of 31309300493 is 39400390313.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 24340056169 + 6969244324 = 156013^2 + 83482^2 .

It is a cyclic number.

It is not a de Polignac number, because 31309300493 - 2² = 31309300489 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 (31309350493) 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, 1334078 + ... + 1357343.

It is an arithmetic number, because the mean of its divisors is an integer number (7828000887).

Almost surely, 2^31309300493 is an apocalyptic number.

It is an amenable number.

31309300493 is a deficient number, since it is larger than the sum of its proper divisors (2703055).

31309300493 is a wasteful number, since it uses less digits than its factorization.

31309300493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2703054.

The product of its (nonzero) digits is 26244, while the sum is 35.

The spelling of 31309300493 in words is "thirty-one billion, three hundred nine million, three hundred thousand, four hundred ninety-three".