77993413 has 2 divisors, whose sum is σ = 77993414. Its totient is φ = 77993412.

The previous prime is 77993411. The next prime is 77993431. The reversal of 77993413 is 31439977.

Together with next prime (77993431) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 42745444 + 35247969 = 6538^2 + 5937^2 .

It is an emirp because it is prime and its reverse (31439977) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 77993413 - 2¹ = 77993411 is a prime.

Together with 77993411, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 77993413.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77993411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38996706 + 38996707.

It is an arithmetic number, because the mean of its divisors is an integer number (38996707).

Almost surely, 2^77993413 is an apocalyptic number.

It is an amenable number.

77993413 is a deficient number, since it is larger than the sum of its proper divisors (1).

77993413 is an equidigital number, since it uses as much as digits as its factorization.

77993413 is an evil number, because the sum of its binary digits is even.

The product of its digits is 142884, while the sum is 43.

The square root of 77993413 is about 8831.3879430133. The cubic root of 77993413 is about 427.2538404796.

The spelling of 77993413 in words is "seventy-seven million, nine hundred ninety-three thousand, four hundred thirteen".