86639261 has 4 divisors (see below), whose sum is σ = 86885052. Its totient is φ = 86393472.

The previous prime is 86639257. The next prime is 86639263. The reversal of 86639261 is 16293668.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 61136761 + 25502500 = 7819^2 + 5050^2 .

It is a cyclic number.

It is not a de Polignac number, because 86639261 - 2² = 86639257 is a prime.

It is a super-2 number, since 2×86639261² = 15012723093252242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (86639263) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 122366 + ... + 123071.

It is an arithmetic number, because the mean of its divisors is an integer number (21721263).

Almost surely, 2^86639261 is an apocalyptic number.

It is an amenable number.

86639261 is a deficient number, since it is larger than the sum of its proper divisors (245791).

86639261 is a wasteful number, since it uses less digits than its factorization.

86639261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 245790.

The product of its digits is 93312, while the sum is 41.

The square root of 86639261 is about 9308.0213257169. The cubic root of 86639261 is about 442.4914801471.

The spelling of 86639261 in words is "eighty-six million, six hundred thirty-nine thousand, two hundred sixty-one".