77138227 has 2 divisors, whose sum is σ = 77138228. Its totient is φ = 77138226.

The previous prime is 77138219. The next prime is 77138287. The reversal of 77138227 is 72283177.

It is a weak prime.

It is an emirp because it is prime and its reverse (72283177) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 77138227 - 2³ = 77138219 is a prime.

It is not a weakly prime, because it can be changed into another prime (77138287) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38569113 + 38569114.

It is an arithmetic number, because the mean of its divisors is an integer number (38569114).

Almost surely, 2^77138227 is an apocalyptic number.

77138227 is a deficient number, since it is larger than the sum of its proper divisors (1).

77138227 is an equidigital number, since it uses as much as digits as its factorization.

77138227 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 32928, while the sum is 37.

The square root of 77138227 is about 8782.8370701044. The cubic root of 77138227 is about 425.6865066297.

The spelling of 77138227 in words is "seventy-seven million, one hundred thirty-eight thousand, two hundred twenty-seven".