77081089 has 2 divisors, whose sum is σ = 77081090. Its totient is φ = 77081088.

The previous prime is 77081087. The next prime is 77081093. The reversal of 77081089 is 98018077.

77081089 = T₇₁₆₇ + T₇₁₆₈ + T₇₁₆₉.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 74218225 + 2862864 = 8615^2 + 1692^2 .

It is a cyclic number.

It is not a de Polignac number, because 77081089 - 2¹ = 77081087 is a prime.

Together with 77081087, 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 (77081083) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38540544 + 38540545.

It is an arithmetic number, because the mean of its divisors is an integer number (38540545).

Almost surely, 2^77081089 is an apocalyptic number.

77081089 is the 7169-th centered triangular number.

It is an amenable number.

77081089 is a deficient number, since it is larger than the sum of its proper divisors (1).

77081089 is an equidigital number, since it uses as much as digits as its factorization.

77081089 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 28224, while the sum is 40.

The square root of 77081089 is about 8779.5836461645. The cubic root of 77081089 is about 425.5813755141.

The spelling of 77081089 in words is "seventy-seven million, eighty-one thousand, eighty-nine".