77351993 has 2 divisors, whose sum is σ = 77351994. Its totient is φ = 77351992.

The previous prime is 77351987. The next prime is 77351999. The reversal of 77351993 is 39915377.

It is a balanced prime because it is at equal distance from previous prime (77351987) and next prime (77351999).

It can be written as a sum of positive squares in only one way, i.e., 59644729 + 17707264 = 7723^2 + 4208^2 .

It is an emirp because it is prime and its reverse (39915377) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 77351993 - 2⁶ = 77351929 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 (77351999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38675996 + 38675997.

It is an arithmetic number, because the mean of its divisors is an integer number (38675997).

Almost surely, 2^77351993 is an apocalyptic number.

It is an amenable number.

77351993 is a deficient number, since it is larger than the sum of its proper divisors (1).

77351993 is an equidigital number, since it uses as much as digits as its factorization.

77351993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 178605, while the sum is 44.

The square root of 77351993 is about 8794.9981807843. The cubic root of 77351993 is about 426.0793657738.

The spelling of 77351993 in words is "seventy-seven million, three hundred fifty-one thousand, nine hundred ninety-three".