77443013 has 2 divisors, whose sum is σ = 77443014. Its totient is φ = 77443012.

The previous prime is 77442997. The next prime is 77443033. The reversal of 77443013 is 31034477.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 44930209 + 32512804 = 6703^2 + 5702^2 .

It is an emirp because it is prime and its reverse (31034477) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 77443013 - 2⁴ = 77442997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77443033) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38721506 + 38721507.

It is an arithmetic number, because the mean of its divisors is an integer number (38721507).

Almost surely, 2^77443013 is an apocalyptic number.

It is an amenable number.

77443013 is a deficient number, since it is larger than the sum of its proper divisors (1).

77443013 is an equidigital number, since it uses as much as digits as its factorization.

77443013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7056, while the sum is 29.

The square root of 77443013 is about 8800.1711915167. The cubic root of 77443013 is about 426.2464226300.

The spelling of 77443013 in words is "seventy-seven million, four hundred forty-three thousand, thirteen".