77229389 has 2 divisors, whose sum is σ = 77229390. Its totient is φ = 77229388.

The previous prime is 77229379. The next prime is 77229391. The reversal of 77229389 is 98392277.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 60762025 + 16467364 = 7795^2 + 4058^2 .

It is a cyclic number.

It is not a de Polignac number, because 77229389 - 2²⁴ = 60452173 is a prime.

Together with 77229391, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77229329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38614694 + 38614695.

It is an arithmetic number, because the mean of its divisors is an integer number (38614695).

Almost surely, 2^77229389 is an apocalyptic number.

It is an amenable number.

77229389 is a deficient number, since it is larger than the sum of its proper divisors (1).

77229389 is an equidigital number, since it uses as much as digits as its factorization.

77229389 is an evil number, because the sum of its binary digits is even.

The product of its digits is 381024, while the sum is 47.

The square root of 77229389 is about 8788.0253185798. The cubic root of 77229389 is about 425.8541327977.

The spelling of 77229389 in words is "seventy-seven million, two hundred twenty-nine thousand, three hundred eighty-nine".