77316247 has 2 divisors, whose sum is σ = 77316248. Its totient is φ = 77316246.

The previous prime is 77316209. The next prime is 77316251. The reversal of 77316247 is 74261377.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77316247 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77316277) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38658123 + 38658124.

It is an arithmetic number, because the mean of its divisors is an integer number (38658124).

Almost surely, 2^77316247 is an apocalyptic number.

77316247 is a deficient number, since it is larger than the sum of its proper divisors (1).

77316247 is an equidigital number, since it uses as much as digits as its factorization.

77316247 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 49392, while the sum is 37.

The square root of 77316247 is about 8792.9657681581. The cubic root of 77316247 is about 426.0137222174.

It can be divided in two parts, 773 and 16247, that added together give a triangular number (17020 = T₁₈₄).

The spelling of 77316247 in words is "seventy-seven million, three hundred sixteen thousand, two hundred forty-seven".