77381873 has 2 divisors, whose sum is σ = 77381874. Its totient is φ = 77381872.

The previous prime is 77381849. The next prime is 77381893. The reversal of 77381873 is 37818377.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 50580544 + 26801329 = 7112^2 + 5177^2 .

It is an emirp because it is prime and its reverse (37818377) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 77381873 - 2⁸ = 77381617 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 (77381833) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38690936 + 38690937.

It is an arithmetic number, because the mean of its divisors is an integer number (38690937).

Almost surely, 2^77381873 is an apocalyptic number.

It is an amenable number.

77381873 is a deficient number, since it is larger than the sum of its proper divisors (1).

77381873 is an equidigital number, since it uses as much as digits as its factorization.

77381873 is an evil number, because the sum of its binary digits is even.

The product of its digits is 197568, while the sum is 44.

The square root of 77381873 is about 8796.6967095609. The cubic root of 77381873 is about 426.1342215571.

The spelling of 77381873 in words is "seventy-seven million, three hundred eighty-one thousand, eight hundred seventy-three".