77549939 has 2 divisors, whose sum is σ = 77549940. Its totient is φ = 77549938.

The previous prime is 77549911. The next prime is 77549977. The reversal of 77549939 is 93994577.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77549939 is a prime.

It is not a weakly prime, because it can be changed into another prime (77549539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38774969 + 38774970.

It is an arithmetic number, because the mean of its divisors is an integer number (38774970).

Almost surely, 2^77549939 is an apocalyptic number.

77549939 is a deficient number, since it is larger than the sum of its proper divisors (1).

77549939 is an equidigital number, since it uses as much as digits as its factorization.

77549939 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2143260, while the sum is 53.

The square root of 77549939 is about 8806.2443186639. The cubic root of 77549939 is about 426.4425060176.

The spelling of 77549939 in words is "seventy-seven million, five hundred forty-nine thousand, nine hundred thirty-nine".