7651328521 has 4 divisors (see below), whose sum is σ = 7651700352. Its totient is φ = 7650956692.

The previous prime is 7651328483. The next prime is 7651328549. The reversal of 7651328521 is 1258231567.

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 an emirpimes, since its reverse is a distinct semiprime: 1258231567 = 61 ⋅20626747.

It is a cyclic number.

It is not a de Polignac number, because 7651328521 - 2²⁵ = 7617774089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7651328021) 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, 153121 + ... + 196846.

It is an arithmetic number, because the mean of its divisors is an integer number (1912925088).

Almost surely, 2^7651328521 is an apocalyptic number.

It is an amenable number.

7651328521 is a deficient number, since it is larger than the sum of its proper divisors (371831).

7651328521 is a wasteful number, since it uses less digits than its factorization.

7651328521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 371830.

The product of its digits is 100800, while the sum is 40.

The square root of 7651328521 is about 87471.8727420421. The cubic root of 7651328521 is about 1970.5113912818.

The spelling of 7651328521 in words is "seven billion, six hundred fifty-one million, three hundred twenty-eight thousand, five hundred twenty-one".