86271561 has 12 divisors (see below), whose sum is σ = 129230192. Its totient is φ = 57514212.

The previous prime is 86271557. The next prime is 86271569. The reversal of 86271561 is 16517268.

It is not a de Polignac number, because 86271561 - 2² = 86271557 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (86271569) 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 11 ways as a sum of consecutive naturals, for example, 177271 + ... + 177756.

Almost surely, 2^86271561 is an apocalyptic number.

86271561 is a gapful number since it is divisible by the number (81) formed by its first and last digit.

It is an amenable number.

86271561 is a deficient number, since it is larger than the sum of its proper divisors (42958631).

86271561 is an equidigital number, since it uses as much as digits as its factorization.

86271561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 355042 (or 355030 counting only the distinct ones).

The product of its digits is 20160, while the sum is 36.

The square root of 86271561 is about 9288.2485431862. The cubic root of 86271561 is about 441.8646094745.

The spelling of 86271561 in words is "eighty-six million, two hundred seventy-one thousand, five hundred sixty-one".