4991389124 has 6 divisors (see below), whose sum is σ = 8734930974. Its totient is φ = 2495694560.

The previous prime is 4991389103. The next prime is 4991389157. The reversal of 4991389124 is 4219831994.

It can be written as a sum of positive squares in only one way, i.e., 4451291524 + 540097600 = 66718^2 + 23240^2 .

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 as a sum of consecutive naturals, namely, 623923637 + ... + 623923644.

It is an arithmetic number, because the mean of its divisors is an integer number (1455821829).

Almost surely, 2^4991389124 is an apocalyptic number.

It is an amenable number.

4991389124 is a deficient number, since it is larger than the sum of its proper divisors (3743541850).

4991389124 is a wasteful number, since it uses less digits than its factorization.

4991389124 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1247847285 (or 1247847283 counting only the distinct ones).

The product of its digits is 559872, while the sum is 50.

The square root of 4991389124 is about 70649.7637929526. The cubic root of 4991389124 is about 1708.9937565703.

The spelling of 4991389124 in words is "four billion, nine hundred ninety-one million, three hundred eighty-nine thousand, one hundred twenty-four".