4791525021 has 12 divisors (see below), whose sum is σ = 7328214972. Its totient is φ = 3006446976.

The previous prime is 4791525007. The next prime is 4791525023. The reversal of 4791525021 is 1205251974.

4791525021 is a `hidden beast` number, since 47 + 91 + 525 + 0 + 2 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 2096357796 + 2695167225 = 45786^2 + 51915^2 .

It is not a de Polignac number, because 4791525021 - 2¹⁹ = 4791000733 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4791525023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15658426 + ... + 15658731.

It is an arithmetic number, because the mean of its divisors is an integer number (610684581).

Almost surely, 2^4791525021 is an apocalyptic number.

It is an amenable number.

4791525021 is a deficient number, since it is larger than the sum of its proper divisors (2536689951).

4791525021 is a wasteful number, since it uses less digits than its factorization.

4791525021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31317180 (or 31317177 counting only the distinct ones).

The product of its (nonzero) digits is 25200, while the sum is 36.

The square root of 4791525021 is about 69220.8423886910. The cubic root of 4791525021 is about 1685.8719576609.

Adding to 4791525021 its reverse (1205251974), we get a palindrome (5996776995).

The spelling of 4791525021 in words is "four billion, seven hundred ninety-one million, five hundred twenty-five thousand, twenty-one".