7975395221 has 4 divisors (see below), whose sum is σ = 7975574412. Its totient is φ = 7975216032.

The previous prime is 7975395187. The next prime is 7975395223. The reversal of 7975395221 is 1225935797.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 6478479121 + 1496916100 = 80489^2 + 38690^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7975395221 is a prime.

It is a super-2 number, since 2×7975395221² (a number of 21 digits) contains 22 as substring.

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 7975395221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7975395223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33995 + ... + 130791.

It is an arithmetic number, because the mean of its divisors is an integer number (1993893603).

Almost surely, 2^7975395221 is an apocalyptic number.

It is an amenable number.

7975395221 is a deficient number, since it is larger than the sum of its proper divisors (179191).

7975395221 is an equidigital number, since it uses as much as digits as its factorization.

7975395221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 179190.

The product of its digits is 1190700, while the sum is 50.

The square root of 7975395221 is about 89305.0682828248. The cubic root of 7975395221 is about 1997.9474960844.

The spelling of 7975395221 in words is "seven billion, nine hundred seventy-five million, three hundred ninety-five thousand, two hundred twenty-one".