7993969281 has 9 divisors (see below), whose sum is σ = 11547231969. Its totient is φ = 5329134036.

The previous prime is 7993969267. The next prime is 7993969339. The reversal of 7993969281 is 1829693997.

It is a happy number.

The square root of 7993969281 is 89409.

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

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 7993969281 - 2³¹ = 5846485633 is a prime.

It is a super-2 number, since 2×7993969281² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (7993969201) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 253326 + ... + 283128.

Almost surely, 2^7993969281 is an apocalyptic number.

7993969281 is the 89409-th square number.

7993969281 is the 44705-th centered octagonal number.

It is an amenable number.

7993969281 is a deficient number, since it is larger than the sum of its proper divisors (3553262688).

7993969281 is an frugal number, since it uses more digits than its factorization.

7993969281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59612 (or 29806 counting only the distinct ones).

The product of its digits is 13226976, while the sum is 63.

The cubic root of 7993969281 is about 1999.4973137472.

The spelling of 7993969281 in words is "seven billion, nine hundred ninety-three million, nine hundred sixty-nine thousand, two hundred eighty-one".