83723581 has 4 divisors (see below), whose sum is σ = 83917372. Its totient is φ = 83529792.

The previous prime is 83723573. The next prime is 83723597. The reversal of 83723581 is 18532738.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 35212356 + 48511225 = 5934^2 + 6965^2 .

It is a cyclic number.

It is not a de Polignac number, because 83723581 - 2³ = 83723573 is a prime.

It is a super-2 number, since 2×83723581² = 14019276030927122, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 83723581.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (83723531) 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, 96246 + ... + 97111.

It is an arithmetic number, because the mean of its divisors is an integer number (20979343).

Almost surely, 2^83723581 is an apocalyptic number.

It is an amenable number.

83723581 is a deficient number, since it is larger than the sum of its proper divisors (193791).

83723581 is a wasteful number, since it uses less digits than its factorization.

83723581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 193790.

The product of its digits is 40320, while the sum is 37.

The square root of 83723581 is about 9150.0590708476. The cubic root of 83723581 is about 437.4709962813.

The spelling of 83723581 in words is "eighty-three million, seven hundred twenty-three thousand, five hundred eighty-one".