82069891 has 4 divisors (see below), whose sum is σ = 82155384. Its totient is φ = 81984400.

The previous prime is 82069879. The next prime is 82069903. The reversal of 82069891 is 19896028.

It is a happy number.

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

It is an interprime number because it is at equal distance from previous prime (82069879) and next prime (82069903).

It is a cyclic number.

It is not a de Polignac number, because 82069891 - 2¹³ = 82061699 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (82069831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 41290 + ... + 43231.

It is an arithmetic number, because the mean of its divisors is an integer number (20538846).

Almost surely, 2^82069891 is an apocalyptic number.

82069891 is a deficient number, since it is larger than the sum of its proper divisors (85493).

82069891 is an equidigital number, since it uses as much as digits as its factorization.

82069891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85492.

The product of its (nonzero) digits is 62208, while the sum is 43.

The square root of 82069891 is about 9059.2434010794. The cubic root of 82069891 is about 434.5715444830.

The spelling of 82069891 in words is "eighty-two million, sixty-nine thousand, eight hundred ninety-one".