7981797329 has 4 divisors (see below), whose sum is σ = 8707415280. Its totient is φ = 7256179380.

The previous prime is 7981797319. The next prime is 7981797337. The reversal of 7981797329 is 9237971897.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 7981797329 - 2²⁴ = 7965020113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7981797319) 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, 362808959 + ... + 362808980.

It is an arithmetic number, because the mean of its divisors is an integer number (2176853820).

Almost surely, 2^7981797329 is an apocalyptic number.

It is an amenable number.

7981797329 is a deficient number, since it is larger than the sum of its proper divisors (725617951).

7981797329 is a wasteful number, since it uses less digits than its factorization.

7981797329 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 725617950.

The product of its digits is 12002256, while the sum is 62.

The square root of 7981797329 is about 89340.9051274947. The cubic root of 7981797329 is about 1998.4819588170.

It can be divided in two parts, 798179 and 7329, that added together give a palindrome (805508).

The spelling of 7981797329 in words is "seven billion, nine hundred eighty-one million, seven hundred ninety-seven thousand, three hundred twenty-nine".