83545221 has 4 divisors (see below), whose sum is σ = 111393632. Its totient is φ = 55696812.

The previous prime is 83545219. The next prime is 83545229. The reversal of 83545221 is 12254538.

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 83545221 - 2¹ = 83545219 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 (83545229) 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, 13924201 + ... + 13924206.

It is an arithmetic number, because the mean of its divisors is an integer number (27848408).

Almost surely, 2^83545221 is an apocalyptic number.

It is an amenable number.

83545221 is a deficient number, since it is larger than the sum of its proper divisors (27848411).

83545221 is a wasteful number, since it uses less digits than its factorization.

83545221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27848410.

The product of its digits is 9600, while the sum is 30.

The square root of 83545221 is about 9140.3074893572. The cubic root of 83545221 is about 437.1601208984.

Adding to 83545221 its reverse (12254538), we get a palindrome (95799759).

It can be divided in two parts, 835 and 45221, that added together give a triangular number (46056 = T₃₀₃).

The spelling of 83545221 in words is "eighty-three million, five hundred forty-five thousand, two hundred twenty-one".