86678549 has 2 divisors, whose sum is σ = 86678550. Its totient is φ = 86678548.

The previous prime is 86678519. The next prime is 86678569. The reversal of 86678549 is 94587668.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 61858225 + 24820324 = 7865^2 + 4982^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-86678549 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 86678549.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (86678519) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43339274 + 43339275.

It is an arithmetic number, because the mean of its divisors is an integer number (43339275).

Almost surely, 2^86678549 is an apocalyptic number.

It is an amenable number.

86678549 is a deficient number, since it is larger than the sum of its proper divisors (1).

86678549 is an equidigital number, since it uses as much as digits as its factorization.

86678549 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2903040, while the sum is 53.

The square root of 86678549 is about 9310.1315243126. The cubic root of 86678549 is about 442.5583550563.

The spelling of 86678549 in words is "eighty-six million, six hundred seventy-eight thousand, five hundred forty-nine".