31894249813 has 4 divisors (see below), whose sum is σ = 33572894560. Its totient is φ = 30215605068.

The previous prime is 31894249759. The next prime is 31894249823.

31894249813 is nontrivially palindromic in base 10.

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 not a de Polignac number, because 31894249813 - 2⁹ = 31894249301 is a prime.

It is a super-2 number, since 2×31894249813² (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 (31894249823) 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, 839322345 + ... + 839322382.

It is an arithmetic number, because the mean of its divisors is an integer number (8393223640).

Almost surely, 2^31894249813 is an apocalyptic number.

It is an amenable number.

31894249813 is a deficient number, since it is larger than the sum of its proper divisors (1678644747).

31894249813 is a wasteful number, since it uses less digits than its factorization.

31894249813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1678644746.

The product of its digits is 1492992, while the sum is 52.

The spelling of 31894249813 in words is "thirty-one billion, eight hundred ninety-four million, two hundred forty-nine thousand, eight hundred thirteen".