82351209 has 8 divisors (see below), whose sum is σ = 110207872. Its totient is φ = 54697680.

The previous prime is 82351183. The next prime is 82351231. The reversal of 82351209 is 90215328.

It is a happy number.

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

It is not a de Polignac number, because 82351209 - 2¹² = 82347113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (82351249) 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, 49834 + ... + 51459.

It is an arithmetic number, because the mean of its divisors is an integer number (13775984).

Almost surely, 2^82351209 is an apocalyptic number.

It is an amenable number.

82351209 is a deficient number, since it is larger than the sum of its proper divisors (27856663).

82351209 is a wasteful number, since it uses less digits than its factorization.

82351209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101567.

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

The square root of 82351209 is about 9074.7566909532. The cubic root of 82351209 is about 435.0675175949.

The spelling of 82351209 in words is "eighty-two million, three hundred fifty-one thousand, two hundred nine".