7993561391 has 4 divisors (see below), whose sum is σ = 7995934632. Its totient is φ = 7991188152.

The previous prime is 7993561343. The next prime is 7993561439. The reversal of 7993561391 is 1931653997.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (7993561343) and next prime (7993561439).

It is a cyclic number.

It is not a de Polignac number, because 7993561391 - 2¹⁸ = 7993299247 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 (7993561321) 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 3 ways as a sum of consecutive naturals, for example, 1181561 + ... + 1188306.

It is an arithmetic number, because the mean of its divisors is an integer number (1998983658).

Almost surely, 2^7993561391 is an apocalyptic number.

7993561391 is a deficient number, since it is larger than the sum of its proper divisors (2373241).

7993561391 is a wasteful number, since it uses less digits than its factorization.

7993561391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2373240.

The product of its digits is 1377810, while the sum is 53.

The square root of 7993561391 is about 89406.7189365542. The cubic root of 7993561391 is about 1999.4633052423.

The spelling of 7993561391 in words is "seven billion, nine hundred ninety-three million, five hundred sixty-one thousand, three hundred ninety-one".