7915248821 has 4 divisors (see below), whose sum is σ = 7915749600. Its totient is φ = 7914748044.

The previous prime is 7915248811. The next prime is 7915248827. The reversal of 7915248821 is 1288425197.

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 a de Polignac number, because none of the positive numbers 2^k-7915248821 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7915248827) 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, 225881 + ... + 258558.

It is an arithmetic number, because the mean of its divisors is an integer number (1978937400).

Almost surely, 2^7915248821 is an apocalyptic number.

It is an amenable number.

7915248821 is a deficient number, since it is larger than the sum of its proper divisors (500779).

7915248821 is a wasteful number, since it uses less digits than its factorization.

7915248821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 500778.

The product of its digits is 322560, while the sum is 47.

The square root of 7915248821 is about 88967.6841386804. The cubic root of 7915248821 is about 1992.9123137730.

The spelling of 7915248821 in words is "seven billion, nine hundred fifteen million, two hundred forty-eight thousand, eight hundred twenty-one".