7480243521 has 6 divisors (see below), whose sum is σ = 10804796210. Its totient is φ = 4986829008.

The previous prime is 7480243451. The next prime is 7480243567. The reversal of 7480243521 is 1253420847.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 5189185296 + 2291058225 = 72036^2 + 47865^2 .

It is not a de Polignac number, because 7480243521 - 2⁹ = 7480243009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7480243591) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 415569076 + ... + 415569093.

Almost surely, 2^7480243521 is an apocalyptic number.

It is an amenable number.

7480243521 is a deficient number, since it is larger than the sum of its proper divisors (3324552689).

7480243521 is a wasteful number, since it uses less digits than its factorization.

7480243521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 831138175 (or 831138172 counting only the distinct ones).

The product of its (nonzero) digits is 53760, while the sum is 36.

The square root of 7480243521 is about 86488.4010778324. The cubic root of 7480243521 is about 1955.7135536285.

It can be divided in two parts, 7480 and 243521, that added together give a square (251001 = 501²).

The spelling of 7480243521 in words is "seven billion, four hundred eighty million, two hundred forty-three thousand, five hundred twenty-one".