4172640521 has 18 divisors (see below), whose sum is σ = 5122823130. Its totient is φ = 3388295232.

The previous prime is 4172640503. The next prime is 4172640569. The reversal of 4172640521 is 1250462714.

4172640521 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 3316492921 + 856147600 = 57589^2 + 29260^2 .

It is a de Polignac number, because none of the positive numbers 2^k-4172640521 is a prime.

It is not an unprimeable number, because it can be changed into a prime (4172640581) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 100256 + ... + 135633.

It is an arithmetic number, because the mean of its divisors is an integer number (284601285).

Almost surely, 2^4172640521 is an apocalyptic number.

It is an amenable number.

4172640521 is a deficient number, since it is larger than the sum of its proper divisors (950182609).

4172640521 is a wasteful number, since it uses less digits than its factorization.

4172640521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 235941 (or 235915 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 32.

The square root of 4172640521 is about 64595.9791395718. The cubic root of 4172640521 is about 1609.9176328372.

The spelling of 4172640521 in words is "four billion, one hundred seventy-two million, six hundred forty thousand, five hundred twenty-one".