77243009 has 2 divisors, whose sum is σ = 77243010. Its totient is φ = 77243008.

The previous prime is 77243003. The next prime is 77243059. The reversal of 77243009 is 90034277.

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., 59367025 + 17875984 = 7705^2 + 4228^2 .

It is a cyclic number.

It is not a de Polignac number, because 77243009 - 2²⁴ = 60465793 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (77243003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38621504 + 38621505.

It is an arithmetic number, because the mean of its divisors is an integer number (38621505).

Almost surely, 2^77243009 is an apocalyptic number.

It is an amenable number.

77243009 is a deficient number, since it is larger than the sum of its proper divisors (1).

77243009 is an equidigital number, since it uses as much as digits as its factorization.

77243009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10584, while the sum is 32.

The square root of 77243009 is about 8788.8002025305. The cubic root of 77243009 is about 425.8791655494.

The spelling of 77243009 in words is "seventy-seven million, two hundred forty-three thousand, nine".