81875499 has 8 divisors (see below), whose sum is σ = 109275600. Its totient is φ = 54529536.

The previous prime is 81875491. The next prime is 81875527. The reversal of 81875499 is 99457818.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 81875499 - 2³ = 81875491 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81875491) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9862 + ... + 16155.

It is an arithmetic number, because the mean of its divisors is an integer number (13659450).

Almost surely, 2^81875499 is an apocalyptic number.

81875499 is a deficient number, since it is larger than the sum of its proper divisors (27400101).

81875499 is a wasteful number, since it uses less digits than its factorization.

81875499 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27069.

The product of its digits is 725760, while the sum is 51.

The square root of 81875499 is about 9048.5081090752. The cubic root of 81875499 is about 434.2281622894.

The spelling of 81875499 in words is "eighty-one million, eight hundred seventy-five thousand, four hundred ninety-nine".