31634675813 has 4 divisors (see below), whose sum is σ = 34068112428. Its totient is φ = 29201239200.

The previous prime is 31634675789. The next prime is 31634675851. The reversal of 31634675813 is 31857643613.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31857643613 = 31 ⋅1027665923.

It can be written as a sum of positive squares in 2 ways, for example, as 13666077604 + 17968598209 = 116902^2 + 134047^2 .

It is a cyclic number.

It is not a de Polignac number, because 31634675813 - 2⁸ = 31634675557 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 (31634675113) 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, 1216718288 + ... + 1216718313.

It is an arithmetic number, because the mean of its divisors is an integer number (8517028107).

Almost surely, 2^31634675813 is an apocalyptic number.

It is an amenable number.

31634675813 is a deficient number, since it is larger than the sum of its proper divisors (2433436615).

31634675813 is a wasteful number, since it uses less digits than its factorization.

31634675813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2433436614.

The product of its digits is 1088640, while the sum is 47.

The spelling of 31634675813 in words is "thirty-one billion, six hundred thirty-four million, six hundred seventy-five thousand, eight hundred thirteen".