77982913 has 2 divisors, whose sum is σ = 77982914. Its totient is φ = 77982912.

The previous prime is 77982911. The next prime is 77982923. The reversal of 77982913 is 31928977.

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., 40870449 + 37112464 = 6393^2 + 6092^2 .

It is a cyclic number.

It is not a de Polignac number, because 77982913 - 2¹ = 77982911 is a prime.

Together with 77982911, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (77982911) 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, 38991456 + 38991457.

It is an arithmetic number, because the mean of its divisors is an integer number (38991457).

Almost surely, 2^77982913 is an apocalyptic number.

It is an amenable number.

77982913 is a deficient number, since it is larger than the sum of its proper divisors (1).

77982913 is an equidigital number, since it uses as much as digits as its factorization.

77982913 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 190512, while the sum is 46.

The square root of 77982913 is about 8830.7934524594. The cubic root of 77982913 is about 427.2346663533.

The spelling of 77982913 in words is "seventy-seven million, nine hundred eighty-two thousand, nine hundred thirteen".