77485139 has 2 divisors, whose sum is σ = 77485140. Its totient is φ = 77485138.

The previous prime is 77485123. The next prime is 77485153. The reversal of 77485139 is 93158477.

It is a strong prime.

It is an emirp because it is prime and its reverse (93158477) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 77485139 - 2⁴ = 77485123 is a prime.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 77485139.

It is not a weakly prime, because it can be changed into another prime (77485169) 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, 38742569 + 38742570.

It is an arithmetic number, because the mean of its divisors is an integer number (38742570).

Almost surely, 2^77485139 is an apocalyptic number.

77485139 is a deficient number, since it is larger than the sum of its proper divisors (1).

77485139 is an equidigital number, since it uses as much as digits as its factorization.

77485139 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 211680, while the sum is 44.

The square root of 77485139 is about 8802.5643422812. The cubic root of 77485139 is about 426.3236958029.

The spelling of 77485139 in words is "seventy-seven million, four hundred eighty-five thousand, one hundred thirty-nine".