77329391 has 2 divisors, whose sum is σ = 77329392. Its totient is φ = 77329390.

The previous prime is 77329363. The next prime is 77329393. The reversal of 77329391 is 19392377.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 77329391 - 2¹⁴ = 77313007 is a prime.

Together with 77329393, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77329393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38664695 + 38664696.

It is an arithmetic number, because the mean of its divisors is an integer number (38664696).

Almost surely, 2^77329391 is an apocalyptic number.

77329391 is a deficient number, since it is larger than the sum of its proper divisors (1).

77329391 is an equidigital number, since it uses as much as digits as its factorization.

77329391 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 71442, while the sum is 41.

The square root of 77329391 is about 8793.7131520195. The cubic root of 77329391 is about 426.0378620642.

The spelling of 77329391 in words is "seventy-seven million, three hundred twenty-nine thousand, three hundred ninety-one".