83557609 has 4 divisors (see below), whose sum is σ = 83790720. Its totient is φ = 83324500.

The previous prime is 83557577. The next prime is 83557637. The reversal of 83557609 is 90675538.

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 a cyclic number.

It is not a de Polignac number, because 83557609 - 2⁵ = 83557577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (83557009) 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, 116017 + ... + 116734.

It is an arithmetic number, because the mean of its divisors is an integer number (20947680).

Almost surely, 2^83557609 is an apocalyptic number.

It is an amenable number.

83557609 is a deficient number, since it is larger than the sum of its proper divisors (233111).

83557609 is a wasteful number, since it uses less digits than its factorization.

83557609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 233110.

The product of its (nonzero) digits is 226800, while the sum is 43.

The square root of 83557609 is about 9140.9851219658. The cubic root of 83557609 is about 437.1817270492.

The spelling of 83557609 in words is "eighty-three million, five hundred fifty-seven thousand, six hundred nine".