77091793 has 2 divisors, whose sum is σ = 77091794. Its totient is φ = 77091792.

The previous prime is 77091743. The next prime is 77091827. The reversal of 77091793 is 39719077.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 52171729 + 24920064 = 7223^2 + 4992^2 .

It is an emirp because it is prime and its reverse (39719077) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77091793 is a prime.

It is not a weakly prime, because it can be changed into another prime (77091713) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38545896 + 38545897.

It is an arithmetic number, because the mean of its divisors is an integer number (38545897).

Almost surely, 2^77091793 is an apocalyptic number.

It is an amenable number.

77091793 is a deficient number, since it is larger than the sum of its proper divisors (1).

77091793 is an equidigital number, since it uses as much as digits as its factorization.

77091793 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 83349, while the sum is 43.

The square root of 77091793 is about 8780.1932211085. The cubic root of 77091793 is about 425.6010743025.

The spelling of 77091793 in words is "seventy-seven million, ninety-one thousand, seven hundred ninety-three".