82391289 has 4 divisors (see below), whose sum is σ = 109855056. Its totient is φ = 54927524.

The previous prime is 82391269. The next prime is 82391357. The reversal of 82391289 is 98219328.

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 a cyclic number.

It is not a de Polignac number, because 82391289 - 2⁷ = 82391161 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 82391289.

It is not an unprimeable number, because it can be changed into a prime (82391219) 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, 13731879 + ... + 13731884.

It is an arithmetic number, because the mean of its divisors is an integer number (27463764).

Almost surely, 2^82391289 is an apocalyptic number.

It is an amenable number.

82391289 is a deficient number, since it is larger than the sum of its proper divisors (27463767).

82391289 is a wasteful number, since it uses less digits than its factorization.

82391289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27463766.

The product of its digits is 62208, while the sum is 42.

The square root of 82391289 is about 9076.9647459930. The cubic root of 82391289 is about 435.1380880138.

The spelling of 82391289 in words is "eighty-two million, three hundred ninety-one thousand, two hundred eighty-nine".