77163881 has 2 divisors, whose sum is σ = 77163882. Its totient is φ = 77163880.

The previous prime is 77163859. The next prime is 77163893. The reversal of 77163881 is 18836177.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 74304400 + 2859481 = 8620^2 + 1691^2 .

It is an emirp because it is prime and its reverse (18836177) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 77163881 - 2⁶ = 77163817 is a prime.

It is a super-2 number, since 2×77163881² = 11908529061964322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (77163181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38581940 + 38581941.

It is an arithmetic number, because the mean of its divisors is an integer number (38581941).

Almost surely, 2^77163881 is an apocalyptic number.

It is an amenable number.

77163881 is a deficient number, since it is larger than the sum of its proper divisors (1).

77163881 is an equidigital number, since it uses as much as digits as its factorization.

77163881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 56448, while the sum is 41.

The square root of 77163881 is about 8784.2974107210. The cubic root of 77163881 is about 425.7336918437.

The spelling of 77163881 in words is "seventy-seven million, one hundred sixty-three thousand, eight hundred eighty-one".