82359209 has 4 divisors (see below), whose sum is σ = 82712916. Its totient is φ = 82005504.

The previous prime is 82359149. The next prime is 82359227. The reversal of 82359209 is 90295328.

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

It can be written as a sum of positive squares in 2 ways, for example, as 7155625 + 75203584 = 2675^2 + 8672^2 .

It is a cyclic number.

It is not a de Polignac number, because 82359209 - 2¹² = 82355113 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (82359229) 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, 176504 + ... + 176969.

It is an arithmetic number, because the mean of its divisors is an integer number (20678229).

Almost surely, 2^82359209 is an apocalyptic number.

It is an amenable number.

82359209 is a deficient number, since it is larger than the sum of its proper divisors (353707).

82359209 is a wasteful number, since it uses less digits than its factorization.

82359209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 353706.

The product of its (nonzero) digits is 38880, while the sum is 38.

The square root of 82359209 is about 9075.1974634164. The cubic root of 82359209 is about 435.0816053356.

The spelling of 82359209 in words is "eighty-two million, three hundred fifty-nine thousand, two hundred nine".