8139597077 has 4 divisors (see below), whose sum is σ = 8141795340. Its totient is φ = 8137398816.

The previous prime is 8139597073. The next prime is 8139597091. The reversal of 8139597077 is 7707959318.

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

It can be written as a sum of positive squares in 2 ways, for example, as 598585156 + 7541011921 = 24466^2 + 86839^2 .

It is a cyclic number.

It is not a de Polignac number, because 8139597077 - 2² = 8139597073 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 (8139597071) 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, 1093568 + ... + 1100985.

It is an arithmetic number, because the mean of its divisors is an integer number (2035448835).

Almost surely, 2^8139597077 is an apocalyptic number.

It is an amenable number.

8139597077 is a deficient number, since it is larger than the sum of its proper divisors (2198263).

8139597077 is a wasteful number, since it uses less digits than its factorization.

8139597077 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2198262.

The product of its (nonzero) digits is 3333960, while the sum is 56.

The square root of 8139597077 is about 90219.7155670533. The cubic root of 8139597077 is about 2011.5660737819.

The spelling of 8139597077 in words is "eight billion, one hundred thirty-nine million, five hundred ninety-seven thousand, seventy-seven".