83173309 has 4 divisors (see below), whose sum is σ = 85107616. Its totient is φ = 81239004.

The previous prime is 83173289. The next prime is 83173319. The reversal of 83173309 is 90337138.

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, and also an emirpimes, since its reverse is a distinct semiprime: 90337138 = 2 ⋅45168569.

It is a cyclic number.

It is not a de Polignac number, because 83173309 - 2⁹ = 83172797 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (83173319) 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, 967089 + ... + 967174.

It is an arithmetic number, because the mean of its divisors is an integer number (21276904).

Almost surely, 2^83173309 is an apocalyptic number.

It is an amenable number.

83173309 is a deficient number, since it is larger than the sum of its proper divisors (1934307).

83173309 is a wasteful number, since it uses less digits than its factorization.

83173309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1934306.

The product of its (nonzero) digits is 13608, while the sum is 34.

The square root of 83173309 is about 9119.9401862074. The cubic root of 83173309 is about 436.5104649503.

The spelling of 83173309 in words is "eighty-three million, one hundred seventy-three thousand, three hundred nine".