83881209 has 4 divisors (see below), whose sum is σ = 111841616. Its totient is φ = 55920804.

The previous prime is 83881201. The next prime is 83881249. The reversal of 83881209 is 90218838.

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 83881209 - 2³ = 83881201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (83881201) 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, 13980199 + ... + 13980204.

It is an arithmetic number, because the mean of its divisors is an integer number (27960404).

Almost surely, 2^83881209 is an apocalyptic number.

It is an amenable number.

83881209 is a deficient number, since it is larger than the sum of its proper divisors (27960407).

83881209 is a wasteful number, since it uses less digits than its factorization.

83881209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27960406.

The product of its (nonzero) digits is 27648, while the sum is 39.

The square root of 83881209 is about 9158.6685167660. The cubic root of 83881209 is about 437.7453691904.

The spelling of 83881209 in words is "eighty-three million, eight hundred eighty-one thousand, two hundred nine".