82491609 has 4 divisors (see below), whose sum is σ = 109988816. Its totient is φ = 54994404.

The previous prime is 82491551. The next prime is 82491623. The reversal of 82491609 is 90619428.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 82491609 - 2²⁴ = 65714393 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 (82491659) 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, 13748599 + ... + 13748604.

It is an arithmetic number, because the mean of its divisors is an integer number (27497204).

Almost surely, 2^82491609 is an apocalyptic number.

It is an amenable number.

82491609 is a deficient number, since it is larger than the sum of its proper divisors (27497207).

82491609 is a wasteful number, since it uses less digits than its factorization.

82491609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27497206.

The product of its (nonzero) digits is 31104, while the sum is 39.

The square root of 82491609 is about 9082.4891411991. The cubic root of 82491609 is about 435.3146250730.

The spelling of 82491609 in words is "eighty-two million, four hundred ninety-one thousand, six hundred nine".