82809251 has 4 divisors (see below), whose sum is σ = 94639152. Its totient is φ = 70979352.

The previous prime is 82809197. The next prime is 82809263. The reversal of 82809251 is 15290828.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-82809251 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (82809151) 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, 5914940 + ... + 5914953.

It is an arithmetic number, because the mean of its divisors is an integer number (23659788).

Almost surely, 2^82809251 is an apocalyptic number.

82809251 is a deficient number, since it is larger than the sum of its proper divisors (11829901).

82809251 is a wasteful number, since it uses less digits than its factorization.

82809251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11829900.

The product of its (nonzero) digits is 11520, while the sum is 35.

The square root of 82809251 is about 9099.9588460608. The cubic root of 82809251 is about 435.8726499398.

The spelling of 82809251 in words is "eighty-two million, eight hundred nine thousand, two hundred fifty-one".