83209999 has 4 divisors (see below), whose sum is σ = 84349936. Its totient is φ = 82070064.

The previous prime is 83209993. The next prime is 83210041. The reversal of 83209999 is 99990238.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99990238 = 2 ⋅49995119.

It is a cyclic number.

It is not a de Polignac number, because 83209999 - 2⁷ = 83209871 is a prime.

It is a Duffinian number.

83209999 is a modest number, since divided by 9999 gives 8320 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (83209993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 569859 + ... + 570004.

It is an arithmetic number, because the mean of its divisors is an integer number (21087484).

Almost surely, 2^83209999 is an apocalyptic number.

83209999 is a deficient number, since it is larger than the sum of its proper divisors (1139937).

83209999 is a wasteful number, since it uses less digits than its factorization.

83209999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1139936.

The product of its (nonzero) digits is 314928, while the sum is 49.

The square root of 83209999 is about 9121.9514907721. The cubic root of 83209999 is about 436.5746410454.

The spelling of 83209999 in words is "eighty-three million, two hundred nine thousand, nine hundred ninety-nine".