4991389125 has 32 divisors (see below), whose sum is σ = 8794251648. Its totient is φ = 2505478400.

The previous prime is 4991389103. The next prime is 4991389157. The reversal of 4991389125 is 5219831994.

It is not a de Polignac number, because 4991389125 - 2⁵ = 4991389093 is a prime.

It is a hoax number, since the sum of its digits (51) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 385107 + ... + 397856.

It is an arithmetic number, because the mean of its divisors is an integer number (274820364).

Almost surely, 2^4991389125 is an apocalyptic number.

It is an amenable number.

4991389125 is a deficient number, since it is larger than the sum of its proper divisors (3802862523).

4991389125 is a wasteful number, since it uses less digits than its factorization.

4991389125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 782998 (or 782988 counting only the distinct ones).

The product of its digits is 699840, while the sum is 51.

The square root of 4991389125 is about 70649.7638000298. The cubic root of 4991389125 is about 1708.9937566844.

The spelling of 4991389125 in words is "four billion, nine hundred ninety-one million, three hundred eighty-nine thousand, one hundred twenty-five".