77374681 has 2 divisors, whose sum is σ = 77374682. Its totient is φ = 77374680.

The previous prime is 77374679. The next prime is 77374721. The reversal of 77374681 is 18647377.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 62094400 + 15280281 = 7880^2 + 3909^2 .

It is a cyclic number.

It is not a de Polignac number, because 77374681 - 2¹ = 77374679 is a prime.

It is a super-2 number, since 2×77374681² = 11973682519703522, which contains 22 as substring.

Together with 77374679, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (77374601) 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, 38687340 + 38687341.

It is an arithmetic number, because the mean of its divisors is an integer number (38687341).

Almost surely, 2^77374681 is an apocalyptic number.

It is an amenable number.

77374681 is a deficient number, since it is larger than the sum of its proper divisors (1).

77374681 is an equidigital number, since it uses as much as digits as its factorization.

77374681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 197568, while the sum is 43.

The square root of 77374681 is about 8796.2879102494. The cubic root of 77374681 is about 426.1210192736.

The spelling of 77374681 in words is "seventy-seven million, three hundred seventy-four thousand, six hundred eighty-one".