77694143 has 2 divisors, whose sum is σ = 77694144. Its totient is φ = 77694142.

The previous prime is 77694137. The next prime is 77694157. The reversal of 77694143 is 34149677.

It is a weak prime.

It is an emirp because it is prime and its reverse (34149677) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 77694143 - 2²⁶ = 10585279 is a prime.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 77694143.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77694193) 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, 38847071 + 38847072.

It is an arithmetic number, because the mean of its divisors is an integer number (38847072).

Almost surely, 2^77694143 is an apocalyptic number.

77694143 is a deficient number, since it is larger than the sum of its proper divisors (1).

77694143 is an equidigital number, since it uses as much as digits as its factorization.

77694143 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 127008, while the sum is 41.

The square root of 77694143 is about 8814.4281153118. The cubic root of 77694143 is about 426.7066654260.

The spelling of 77694143 in words is "seventy-seven million, six hundred ninety-four thousand, one hundred forty-three".