7481479721 has 4 divisors (see below), whose sum is σ = 7806761472. Its totient is φ = 7156197972.

The previous prime is 7481479699. The next prime is 7481479771. The reversal of 7481479721 is 1279741847.

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.

It is a cyclic number.

It is not a de Polignac number, because 7481479721 - 2¹⁸ = 7481217577 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 7481479721.

It is not an unprimeable number, because it can be changed into a prime (7481479771) 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 3 ways as a sum of consecutive naturals, for example, 162640841 + ... + 162640886.

It is an arithmetic number, because the mean of its divisors is an integer number (1951690368).

Almost surely, 2^7481479721 is an apocalyptic number.

It is an amenable number.

7481479721 is a deficient number, since it is larger than the sum of its proper divisors (325281751).

7481479721 is a wasteful number, since it uses less digits than its factorization.

7481479721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 325281750.

The product of its digits is 790272, while the sum is 50.

The square root of 7481479721 is about 86495.5474056324. The cubic root of 7481479721 is about 1955.8212827382.

The spelling of 7481479721 in words is "seven billion, four hundred eighty-one million, four hundred seventy-nine thousand, seven hundred twenty-one".