77291693 has 2 divisors, whose sum is σ = 77291694. Its totient is φ = 77291692.

The previous prime is 77291689. The next prime is 77291713. The reversal of 77291693 is 39619277.

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., 66552964 + 10738729 = 8158^2 + 3277^2 .

It is an emirp because it is prime and its reverse (39619277) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 77291693 - 2² = 77291689 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77291603) 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, 38645846 + 38645847.

It is an arithmetic number, because the mean of its divisors is an integer number (38645847).

Almost surely, 2^77291693 is an apocalyptic number.

It is an amenable number.

77291693 is a deficient number, since it is larger than the sum of its proper divisors (1).

77291693 is an equidigital number, since it uses as much as digits as its factorization.

77291693 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 142884, while the sum is 44.

The square root of 77291693 is about 8791.5694275823. The cubic root of 77291693 is about 425.9686198020.

The spelling of 77291693 in words is "seventy-seven million, two hundred ninety-one thousand, six hundred ninety-three".