4491991625 has 32 divisors (see below), whose sum is σ = 6124809600. Its totient is φ = 3262008000.

The previous prime is 4491991619. The next prime is 4491991657. The reversal of 4491991625 is 5261991944.

It is not a de Polignac number, because 4491991625 - 2⁶ = 4491991561 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1093826 + ... + 1097924.

It is an arithmetic number, because the mean of its divisors is an integer number (191400300).

Almost surely, 2^4491991625 is an apocalyptic number.

It is an amenable number.

4491991625 is a deficient number, since it is larger than the sum of its proper divisors (1632817975).

4491991625 is a wasteful number, since it uses less digits than its factorization.

4491991625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4922 (or 4912 counting only the distinct ones).

The product of its digits is 699840, while the sum is 50.

The square root of 4491991625 is about 67022.3218413090. The cubic root of 4491991625 is about 1649.9836698721.

The spelling of 4491991625 in words is "four billion, four hundred ninety-one million, nine hundred ninety-one thousand, six hundred twenty-five".