81115299 has 24 divisors (see below), whose sum is σ = 120822624. Its totient is φ = 52416000.

The previous prime is 81115277. The next prime is 81115327. The reversal of 81115299 is 99251118.

It is not a de Polignac number, because 81115299 - 2⁵ = 81115267 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81115219) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 37939 + ... + 40019.

It is an arithmetic number, because the mean of its divisors is an integer number (5034276).

Almost surely, 2^81115299 is an apocalyptic number.

81115299 is a deficient number, since it is larger than the sum of its proper divisors (39707325).

81115299 is a wasteful number, since it uses less digits than its factorization.

81115299 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2219 (or 2216 counting only the distinct ones).

The product of its digits is 6480, while the sum is 36.

The square root of 81115299 is about 9006.4032221526. The cubic root of 81115299 is about 432.8800699738.

It can be divided in two parts, 811 and 15299, that added together give a triangular number (16110 = T₁₇₉).

The spelling of 81115299 in words is "eighty-one million, one hundred fifteen thousand, two hundred ninety-nine".