331812813 has 16 divisors (see below), whose sum is σ = 450812736. Its totient is φ = 217042560.

The previous prime is 331812791. The next prime is 331812821. The reversal of 331812813 is 318218133.

It is not a de Polignac number, because 331812813 - 2¹⁰ = 331811789 is a prime.

It is a super-2 number, since 2×331812813² = 220199485741945938, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (331812823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 39298 + ... + 46988.

It is an arithmetic number, because the mean of its divisors is an integer number (28175796).

Almost surely, 2^331812813 is an apocalyptic number.

It is an amenable number.

331812813 is a deficient number, since it is larger than the sum of its proper divisors (118999923).

331812813 is a wasteful number, since it uses less digits than its factorization.

331812813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7964.

The product of its digits is 3456, while the sum is 30.

The square root of 331812813 is about 18215.7298234246. The cubic root of 331812813 is about 692.3053973210.

The spelling of 331812813 in words is "three hundred thirty-one million, eight hundred twelve thousand, eight hundred thirteen".