83955209 has 4 divisors (see below), whose sum is σ = 90413316. Its totient is φ = 77497104.

The previous prime is 83955199. The next prime is 83955211. The reversal of 83955209 is 90255938.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 90255938 = 2 ⋅45127969.

It can be written as a sum of positive squares in 2 ways, for example, as 43033600 + 40921609 = 6560^2 + 6397^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-83955209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (83955239) 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, 3229034 + ... + 3229059.

It is an arithmetic number, because the mean of its divisors is an integer number (22603329).

Almost surely, 2^83955209 is an apocalyptic number.

It is an amenable number.

83955209 is a deficient number, since it is larger than the sum of its proper divisors (6458107).

83955209 is a wasteful number, since it uses less digits than its factorization.

83955209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6458106.

The product of its (nonzero) digits is 97200, while the sum is 41.

The square root of 83955209 is about 9162.7075147033. The cubic root of 83955209 is about 437.8740576719.

The spelling of 83955209 in words is "eighty-three million, nine hundred fifty-five thousand, two hundred nine".