77144449 has 2 divisors, whose sum is σ = 77144450. Its totient is φ = 77144448.

The previous prime is 77144401. The next prime is 77144471. The reversal of 77144449 is 94444177.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 72982849 + 4161600 = 8543^2 + 2040^2 .

It is a cyclic number.

It is not a de Polignac number, because 77144449 - 2¹⁹ = 76620161 is a prime.

It is not a weakly prime, because it can be changed into another prime (77144489) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38572224 + 38572225.

It is an arithmetic number, because the mean of its divisors is an integer number (38572225).

Almost surely, 2^77144449 is an apocalyptic number.

It is an amenable number.

77144449 is a deficient number, since it is larger than the sum of its proper divisors (1).

77144449 is an equidigital number, since it uses as much as digits as its factorization.

77144449 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 112896, while the sum is 40.

The square root of 77144449 is about 8783.1912765236. The cubic root of 77144449 is about 425.6979516695.

The spelling of 77144449 in words is "seventy-seven million, one hundred forty-four thousand, four hundred forty-nine".