77144729 has 2 divisors, whose sum is σ = 77144730. Its totient is φ = 77144728.

The previous prime is 77144723. The next prime is 77144747. The reversal of 77144729 is 92744177.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 74736025 + 2408704 = 8645^2 + 1552^2 .

It is an emirp because it is prime and its reverse (92744177) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 77144729 - 2⁴ = 77144713 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (77144723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38572364 + 38572365.

It is an arithmetic number, because the mean of its divisors is an integer number (38572365).

Almost surely, 2^77144729 is an apocalyptic number.

It is an amenable number.

77144729 is a deficient number, since it is larger than the sum of its proper divisors (1).

77144729 is an equidigital number, since it uses as much as digits as its factorization.

77144729 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 98784, while the sum is 41.

The square root of 77144729 is about 8783.2072160459. The cubic root of 77144729 is about 425.6984667002.

The spelling of 77144729 in words is "seventy-seven million, one hundred forty-four thousand, seven hundred twenty-nine".