77122139 has 2 divisors, whose sum is σ = 77122140. Its totient is φ = 77122138.

The previous prime is 77122127. The next prime is 77122163. The reversal of 77122139 is 93122177.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 77122139 - 2¹² = 77118043 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (77122439) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38561069 + 38561070.

It is an arithmetic number, because the mean of its divisors is an integer number (38561070).

Almost surely, 2^77122139 is an apocalyptic number.

77122139 is a deficient number, since it is larger than the sum of its proper divisors (1).

77122139 is an equidigital number, since it uses as much as digits as its factorization.

77122139 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5292, while the sum is 32.

The square root of 77122139 is about 8781.9211451709. The cubic root of 77122139 is about 425.6569107517.

The spelling of 77122139 in words is "seventy-seven million, one hundred twenty-two thousand, one hundred thirty-nine".