4625172521 has 4 divisors (see below), whose sum is σ = 4625318544. Its totient is φ = 4625026500.

The previous prime is 4625172509. The next prime is 4625172523. The reversal of 4625172521 is 1252715264.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 4625172521 - 2¹⁰ = 4625171497 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (4625172523) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3335 + ... + 96236.

It is an arithmetic number, because the mean of its divisors is an integer number (1156329636).

Almost surely, 2^4625172521 is an apocalyptic number.

It is an amenable number.

4625172521 is a deficient number, since it is larger than the sum of its proper divisors (146023).

4625172521 is an equidigital number, since it uses as much as digits as its factorization.

4625172521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146022.

The product of its digits is 33600, while the sum is 35.

The square root of 4625172521 is about 68008.6209314672. The cubic root of 4625172521 is about 1666.1316418986.

Adding to 4625172521 its reverse (1252715264), we get a palindrome (5877887785).

The spelling of 4625172521 in words is "four billion, six hundred twenty-five million, one hundred seventy-two thousand, five hundred twenty-one".