81825283 has 4 divisors (see below), whose sum is σ = 85382928. Its totient is φ = 78267640.

The previous prime is 81825281. The next prime is 81825307. The reversal of 81825283 is 38252818.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 81825283 - 2¹ = 81825281 is a prime.

It is a super-3 number, since 3×81825283³ (a number of 25 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81825281) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1778788 + ... + 1778833.

It is an arithmetic number, because the mean of its divisors is an integer number (21345732).

Almost surely, 2^81825283 is an apocalyptic number.

81825283 is a deficient number, since it is larger than the sum of its proper divisors (3557645).

81825283 is a wasteful number, since it uses less digits than its factorization.

81825283 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3557644.

The product of its digits is 30720, while the sum is 37.

The square root of 81825283 is about 9045.7328614104. The cubic root of 81825283 is about 434.1393703185.

The spelling of 81825283 in words is "eighty-one million, eight hundred twenty-five thousand, two hundred eighty-three".