7945761321 has 27 divisors (see below), whose sum is σ = 11767359357. Its totient is φ = 5166496440.

The previous prime is 7945761287. The next prime is 7945761323. The reversal of 7945761321 is 1231675497.

The square root of 7945761321 is 89139.

It is a perfect power (a square), and thus also a powerful number.

7945761321 is a `hidden beast` number, since 7 + 9 + 4 + 5 + 7 + 613 + 21 = 666.

It is not a de Polignac number, because 7945761321 - 2⁷ = 7945761193 is a prime.

It is not an unprimeable number, because it can be changed into a prime (7945761323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 11498586 + ... + 11499276.

Almost surely, 2^7945761321 is an apocalyptic number.

7945761321 is the 89139-th square number.

7945761321 is the 44570-th centered octagonal number.

It is an amenable number.

7945761321 is a deficient number, since it is larger than the sum of its proper divisors (3821598036).

7945761321 is an frugal number, since it uses more digits than its factorization.

7945761321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1474 (or 737 counting only the distinct ones).

The product of its digits is 317520, while the sum is 45.

The cubic root of 7945761321 is about 1995.4698567317.

The spelling of 7945761321 in words is "seven billion, nine hundred forty-five million, seven hundred sixty-one thousand, three hundred twenty-one".