86777861 has 2 divisors, whose sum is σ = 86777862. Its totient is φ = 86777860.

The previous prime is 86777851. The next prime is 86777869. The reversal of 86777861 is 16877768.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 86676100 + 101761 = 9310^2 + 319^2 .

It is a cyclic number.

It is not a de Polignac number, because 86777861 - 2²⁶ = 19668997 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (86777869) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43388930 + 43388931.

It is an arithmetic number, because the mean of its divisors is an integer number (43388931).

Almost surely, 2^86777861 is an apocalyptic number.

It is an amenable number.

86777861 is a deficient number, since it is larger than the sum of its proper divisors (1).

86777861 is an equidigital number, since it uses as much as digits as its factorization.

86777861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 790272, while the sum is 50.

The square root of 86777861 is about 9315.4635418749. The cubic root of 86777861 is about 442.7273110467.

The spelling of 86777861 in words is "eighty-six million, seven hundred seventy-seven thousand, eight hundred sixty-one".