81514209 has 16 divisors (see below), whose sum is σ = 125916032. Its totient is φ = 45940608.

The previous prime is 81514207. The next prime is 81514229. The reversal of 81514209 is 90241518.

It is a happy number.

It is not a de Polignac number, because 81514209 - 2¹ = 81514207 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81514207) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25054 + ... + 28119.

It is an arithmetic number, because the mean of its divisors is an integer number (7869752).

Almost surely, 2^81514209 is an apocalyptic number.

It is an amenable number.

81514209 is a deficient number, since it is larger than the sum of its proper divisors (44401823).

81514209 is a wasteful number, since it uses less digits than its factorization.

81514209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53256.

The product of its (nonzero) digits is 2880, while the sum is 30.

The square root of 81514209 is about 9028.5219720617. The cubic root of 81514209 is about 433.5885178744.

The spelling of 81514209 in words is "eighty-one million, five hundred fourteen thousand, two hundred nine".