77138771 has 2 divisors, whose sum is σ = 77138772. Its totient is φ = 77138770.

The previous prime is 77138767. The next prime is 77138773. The reversal of 77138771 is 17783177.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 77138771 - 2² = 77138767 is a prime.

Together with 77138773, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (77138773) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38569385 + 38569386.

It is an arithmetic number, because the mean of its divisors is an integer number (38569386).

Almost surely, 2^77138771 is an apocalyptic number.

77138771 is a deficient number, since it is larger than the sum of its proper divisors (1).

77138771 is an equidigital number, since it uses as much as digits as its factorization.

77138771 is an evil number, because the sum of its binary digits is even.

The product of its digits is 57624, while the sum is 41.

The square root of 77138771 is about 8782.8680395415. The cubic root of 77138771 is about 425.6875073135.

The spelling of 77138771 in words is "seventy-seven million, one hundred thirty-eight thousand, seven hundred seventy-one".