996613821 has 32 divisors (see below), whose sum is σ = 1776204800. Its totient is φ = 539518320.

The previous prime is 996613817. The next prime is 996613829. The reversal of 996613821 is 128316699.

It is a happy number.

996613821 is a `hidden beast` number, since 9 + 9 + 6 + 613 + 8 + 21 = 666.

It is not a de Polignac number, because 996613821 - 2² = 996613817 is a prime.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (996613829) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 135175 + ... + 142356.

It is an arithmetic number, because the mean of its divisors is an integer number (55506400).

Almost surely, 2^996613821 is an apocalyptic number.

It is an amenable number.

996613821 is a deficient number, since it is larger than the sum of its proper divisors (779590979).

996613821 is a wasteful number, since it uses less digits than its factorization.

996613821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 277566 (or 277560 counting only the distinct ones).

The product of its digits is 139968, while the sum is 45.

The square root of 996613821 is about 31569.1910095903. The cubic root of 996613821 is about 998.8699972414.

The spelling of 996613821 in words is "nine hundred ninety-six million, six hundred thirteen thousand, eight hundred twenty-one".