8139683977 has 2 divisors, whose sum is σ = 8139683978. Its totient is φ = 8139683976.

The previous prime is 8139683941. The next prime is 8139684001. The reversal of 8139683977 is 7793869318.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8061166656 + 78517321 = 89784^2 + 8861^2 .

It is a cyclic number.

It is not a de Polignac number, because 8139683977 - 2¹⁵ = 8139651209 is a prime.

It is not a weakly prime, because it can be changed into another prime (8139683927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4069841988 + 4069841989.

It is an arithmetic number, because the mean of its divisors is an integer number (4069841989).

Almost surely, 2^8139683977 is an apocalyptic number.

It is an amenable number.

8139683977 is a deficient number, since it is larger than the sum of its proper divisors (1).

8139683977 is an equidigital number, since it uses as much as digits as its factorization.

8139683977 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13716864, while the sum is 61.

The square root of 8139683977 is about 90220.1971678182. The cubic root of 8139683977 is about 2011.5732323865.

The spelling of 8139683977 in words is "eight billion, one hundred thirty-nine million, six hundred eighty-three thousand, nine hundred seventy-seven".