82209969 has 6 divisors (see below), whose sum is σ = 118747746. Its totient is φ = 54806640.

The previous prime is 82209947. The next prime is 82209971. The reversal of 82209969 is 96990228.

It can be written as a sum of positive squares in only one way, i.e., 45158400 + 37051569 = 6720^2 + 6087^2 .

It is not a de Polignac number, because 82209969 - 2²¹ = 80112817 is a prime.

It is a super-2 number, since 2×82209969² = 13516958005961922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (82209929) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4567212 + ... + 4567229.

It is an arithmetic number, because the mean of its divisors is an integer number (19791291).

Almost surely, 2^82209969 is an apocalyptic number.

It is an amenable number.

82209969 is a deficient number, since it is larger than the sum of its proper divisors (36537777).

82209969 is a wasteful number, since it uses less digits than its factorization.

82209969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9134447 (or 9134444 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 45.

The square root of 82209969 is about 9066.9713245383. The cubic root of 82209969 is about 434.8186481463.

The spelling of 82209969 in words is "eighty-two million, two hundred nine thousand, nine hundred sixty-nine".