1639633099 has 6 divisors (see below), whose sum is σ = 1775460876. Its totient is φ = 1513507320.

The previous prime is 1639633087. The next prime is 1639633157. The reversal of 1639633099 is 9903369361.

It is a de Polignac number, because none of the positive numbers 2^k-1639633099 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1639633049) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4850817 + ... + 4851154.

It is an arithmetic number, because the mean of its divisors is an integer number (295910146).

Almost surely, 2^1639633099 is an apocalyptic number.

1639633099 is a deficient number, since it is larger than the sum of its proper divisors (135827777).

1639633099 is an equidigital number, since it uses as much as digits as its factorization.

1639633099 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9701997 (or 9701984 counting only the distinct ones).

The product of its (nonzero) digits is 708588, while the sum is 49.

The square root of 1639633099 is about 40492.3832220333. The cubic root of 1639633099 is about 1179.1857590158.

The spelling of 1639633099 in words is "one billion, six hundred thirty-nine million, six hundred thirty-three thousand, ninety-nine".