83888891 has 4 divisors (see below), whose sum is σ = 85141032. Its totient is φ = 82636752.

The previous prime is 83888869. The next prime is 83888921. The reversal of 83888891 is 19888838.

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

It is a cyclic number.

It is not a de Polignac number, because 83888891 - 2¹⁴ = 83872507 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (83888491) 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, 625970 + ... + 626103.

It is an arithmetic number, because the mean of its divisors is an integer number (21285258).

Almost surely, 2^83888891 is an apocalyptic number.

83888891 is a deficient number, since it is larger than the sum of its proper divisors (1252141).

83888891 is a wasteful number, since it uses less digits than its factorization.

83888891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1252140.

The product of its digits is 884736, while the sum is 53.

The square root of 83888891 is about 9159.0878912695. The cubic root of 83888891 is about 437.7587319658.

Subtracting from 83888891 its sum of digits (53), we obtain a palindrome (83888838).

The spelling of 83888891 in words is "eighty-three million, eight hundred eighty-eight thousand, eight hundred ninety-one".