8513994621 has 24 divisors (see below), whose sum is σ = 13155328224. Its totient is φ = 4856462080.

The previous prime is 8513994521. The next prime is 8513994701. The reversal of 8513994621 is 1264993158.

It is not a de Polignac number, because 8513994621 - 2¹⁵ = 8513961853 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8513994421) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 436830 + ... + 455903.

It is an arithmetic number, because the mean of its divisors is an integer number (548138676).

Almost surely, 2^8513994621 is an apocalyptic number.

It is an amenable number.

8513994621 is a deficient number, since it is larger than the sum of its proper divisors (4641333603).

8513994621 is a wasteful number, since it uses less digits than its factorization.

8513994621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 892781 (or 892764 counting only the distinct ones).

The product of its digits is 466560, while the sum is 48.

The square root of 8513994621 is about 92271.3098476444. The cubic root of 8513994621 is about 2041.9469606886.

The spelling of 8513994621 in words is "eight billion, five hundred thirteen million, nine hundred ninety-four thousand, six hundred twenty-one".