83211661 has 8 divisors (see below), whose sum is σ = 89709984. Its totient is φ = 76727280.

The previous prime is 83211647. The next prime is 83211671. The reversal of 83211661 is 16611238.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-83211661 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (83211671) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11250 + ... + 17116.

It is an arithmetic number, because the mean of its divisors is an integer number (11213748).

Almost surely, 2^83211661 is an apocalyptic number.

It is an amenable number.

83211661 is a deficient number, since it is larger than the sum of its proper divisors (6498323).

83211661 is a wasteful number, since it uses less digits than its factorization.

83211661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6971.

The product of its digits is 1728, while the sum is 28.

The square root of 83211661 is about 9122.0425892450. The cubic root of 83211661 is about 436.5775476762.

Adding to 83211661 its reverse (16611238), we get a palindrome (99822899).

The spelling of 83211661 in words is "eighty-three million, two hundred eleven thousand, six hundred sixty-one".