996917621 has 8 divisors (see below), whose sum is σ = 1206354240. Its totient is φ = 804235968.

The previous prime is 996917599. The next prime is 996917629. The reversal of 996917621 is 126719699.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 996917621 - 2¹⁰ = 996916597 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 996917621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (996917629) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4188611 + ... + 4188848.

It is an arithmetic number, because the mean of its divisors is an integer number (150794280).

Almost surely, 2^996917621 is an apocalyptic number.

It is an amenable number.

996917621 is a deficient number, since it is larger than the sum of its proper divisors (209436619).

996917621 is a wasteful number, since it uses less digits than its factorization.

996917621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8377483.

The product of its digits is 367416, while the sum is 50.

The square root of 996917621 is about 31574.0022961930. The cubic root of 996917621 is about 998.9714828485.

The spelling of 996917621 in words is "nine hundred ninety-six million, nine hundred seventeen thousand, six hundred twenty-one".