77169139 has 2 divisors, whose sum is σ = 77169140. Its totient is φ = 77169138.

The previous prime is 77169121. The next prime is 77169143. The reversal of 77169139 is 93196177.

It is a strong prime.

It is an emirp because it is prime and its reverse (93196177) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77169139 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 77169095 and 77169104.

It is not a weakly prime, because it can be changed into another prime (77169179) 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, 38584569 + 38584570.

It is an arithmetic number, because the mean of its divisors is an integer number (38584570).

Almost surely, 2^77169139 is an apocalyptic number.

77169139 is a deficient number, since it is larger than the sum of its proper divisors (1).

77169139 is an equidigital number, since it uses as much as digits as its factorization.

77169139 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 71442, while the sum is 43.

The square root of 77169139 is about 8784.5966896608. The cubic root of 77169139 is about 425.7433615531.

The spelling of 77169139 in words is "seventy-seven million, one hundred sixty-nine thousand, one hundred thirty-nine".