86929281 has 10 divisors (see below), whose sum is σ = 129857442. Its totient is φ = 57952800.

The previous prime is 86929277. The next prime is 86929289. The reversal of 86929281 is 18292968.

It can be written as a sum of positive squares in only one way, i.e., 49914225 + 37015056 = 7065^2 + 6084^2 .

It is not a de Polignac number, because 86929281 - 2² = 86929277 is a prime.

It is a super-2 number, since 2×86929281² = 15113399790353922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (86929289) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 536520 + ... + 536681.

Almost surely, 2^86929281 is an apocalyptic number.

86929281 is a gapful number since it is divisible by the number (81) formed by its first and last digit.

It is an amenable number.

86929281 is a deficient number, since it is larger than the sum of its proper divisors (42928161).

86929281 is a wasteful number, since it uses less digits than its factorization.

86929281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1073213 (or 1073204 counting only the distinct ones).

The product of its digits is 124416, while the sum is 45.

The square root of 86929281 is about 9323.5873460809. The cubic root of 86929281 is about 442.9846686057.

The spelling of 86929281 in words is "eighty-six million, nine hundred twenty-nine thousand, two hundred eighty-one".