82309251 has 4 divisors (see below), whose sum is σ = 109745672. Its totient is φ = 54872832.

The previous prime is 82309237. The next prime is 82309259. The reversal of 82309251 is 15290328.

It is a happy number.

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

It is not a de Polignac number, because 82309251 - 2⁵ = 82309219 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (82309259) 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, 13718206 + ... + 13718211.

It is an arithmetic number, because the mean of its divisors is an integer number (27436418).

Almost surely, 2^82309251 is an apocalyptic number.

82309251 is a deficient number, since it is larger than the sum of its proper divisors (27436421).

82309251 is a wasteful number, since it uses less digits than its factorization.

82309251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27436420.

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 82309251 is about 9072.4445988939. Note that the first 3 decimals coincide. The cubic root of 82309251 is about 434.9936159718.

Adding to 82309251 its reverse (15290328), we get a palindrome (97599579).

The spelling of 82309251 in words is "eighty-two million, three hundred nine thousand, two hundred fifty-one".