7989601391 has 4 divisors (see below), whose sum is σ = 8035784232. Its totient is φ = 7943418552.

The previous prime is 7989601339. The next prime is 7989601421. The reversal of 7989601391 is 1931069897.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1931069897 = 21839 ⋅88423.

It is a cyclic number.

It is not a de Polignac number, because 7989601391 - 2²⁶ = 7922492527 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 (7989607391) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23091161 + ... + 23091506.

It is an arithmetic number, because the mean of its divisors is an integer number (2008946058).

Almost surely, 2^7989601391 is an apocalyptic number.

7989601391 is a deficient number, since it is larger than the sum of its proper divisors (46182841).

7989601391 is a wasteful number, since it uses less digits than its factorization.

7989601391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46182840.

The product of its (nonzero) digits is 734832, while the sum is 53.

The square root of 7989601391 is about 89384.5702064959. The cubic root of 7989601391 is about 1999.1330735235.

The spelling of 7989601391 in words is "seven billion, nine hundred eighty-nine million, six hundred one thousand, three hundred ninety-one".