77127139 has 2 divisors, whose sum is σ = 77127140. Its totient is φ = 77127138.

The previous prime is 77127103. The next prime is 77127151. The reversal of 77127139 is 93172177.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 77127139 - 2⁹ = 77126627 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 77127098 and 77127107.

It is not a weakly prime, because it can be changed into another prime (77127179) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38563569 + 38563570.

It is an arithmetic number, because the mean of its divisors is an integer number (38563570).

Almost surely, 2^77127139 is an apocalyptic number.

77127139 is a deficient number, since it is larger than the sum of its proper divisors (1).

77127139 is an equidigital number, since it uses as much as digits as its factorization.

77127139 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18522, while the sum is 37.

The square root of 77127139 is about 8782.2058163083. The cubic root of 77127139 is about 425.6661093147. Note that the first 3 decimals are identical.

The spelling of 77127139 in words is "seventy-seven million, one hundred twenty-seven thousand, one hundred thirty-nine".