83581211 has 12 divisors (see below), whose sum is σ = 97530192. Its totient is φ = 71626632.

The previous prime is 83581151. The next prime is 83581217. The reversal of 83581211 is 11218538.

It is a de Polignac number, because none of the positive numbers 2^k-83581211 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (83581217) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14321 + ... + 19293.

It is an arithmetic number, because the mean of its divisors is an integer number (8127516).

Almost surely, 2^83581211 is an apocalyptic number.

83581211 is a deficient number, since it is larger than the sum of its proper divisors (13948981).

83581211 is an frugal number, since it uses more digits than its factorization.

83581211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5008 (or 4980 counting only the distinct ones).

The product of its digits is 1920, while the sum is 29.

The square root of 83581211 is about 9142.2760295235. The cubic root of 83581211 is about 437.2228858452. Note that the first 3 decimals are identical.

Adding to 83581211 its reverse (11218538), we get a palindrome (94799749).

The spelling of 83581211 in words is "eighty-three million, five hundred eighty-one thousand, two hundred eleven".