77144917 has 2 divisors, whose sum is σ = 77144918. Its totient is φ = 77144916.

The previous prime is 77144909. The next prime is 77144941. The reversal of 77144917 is 71944177.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 41036836 + 36108081 = 6406^2 + 6009^2 .

It is an emirp because it is prime and its reverse (71944177) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 77144917 - 2³ = 77144909 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 77144917.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77144017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38572458 + 38572459.

It is an arithmetic number, because the mean of its divisors is an integer number (38572459).

Almost surely, 2^77144917 is an apocalyptic number.

It is an amenable number.

77144917 is a deficient number, since it is larger than the sum of its proper divisors (1).

77144917 is an equidigital number, since it uses as much as digits as its factorization.

77144917 is an evil number, because the sum of its binary digits is even.

The product of its digits is 49392, while the sum is 40.

The square root of 77144917 is about 8783.2179182803. The cubic root of 77144917 is about 425.6988125059.

The spelling of 77144917 in words is "seventy-seven million, one hundred forty-four thousand, nine hundred seventeen".