4991139904 has 21 divisors (see below), whose sum is σ = 9905414911. Its totient is φ = 2495287360.

The previous prime is 4991139889. The next prime is 4991139919. The reversal of 4991139904 is 4099311994.

It is a happy number.

The square root of 4991139904 is 70648.

It is a perfect power (a square), and thus also a powerful number.

It is an interprime number because it is at equal distance from previous prime (4991139889) and next prime (4991139919).

It is a super-2 number, since 2×4991139904² = 49822955082602258432, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 560769 + ... + 569599.

Almost surely, 2^4991139904 is an apocalyptic number.

4991139904 is the 70648-th square number.

It is an amenable number.

4991139904 is a deficient number, since it is larger than the sum of its proper divisors (4914275007).

4991139904 is an frugal number, since it uses more digits than its factorization.

4991139904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17674 (or 8833 counting only the distinct ones).

The product of its (nonzero) digits is 314928, while the sum is 49.

The cubic root of 4991139904 is about 1708.9653127508.

Multiplying 4991139904 by its sum of digits (49), we get a square (244565855296 = 494536²).

The spelling of 4991139904 in words is "four billion, nine hundred ninety-one million, one hundred thirty-nine thousand, nine hundred four".