83217861 has 20 divisors (see below), whose sum is σ = 124581600. Its totient is φ = 55358856.

The previous prime is 83217851. The next prime is 83217877. The reversal of 83217861 is 16871238.

It is not a de Polignac number, because 83217861 - 2¹¹ = 83215813 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (83217811) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 52600 + ... + 54158.

It is an arithmetic number, because the mean of its divisors is an integer number (6229080).

Almost surely, 2^83217861 is an apocalyptic number.

83217861 is a gapful number since it is divisible by the number (81) formed by its first and last digit.

It is an amenable number.

83217861 is a deficient number, since it is larger than the sum of its proper divisors (41363739).

83217861 is a wasteful number, since it uses less digits than its factorization.

83217861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2230 (or 2221 counting only the distinct ones).

The product of its digits is 16128, while the sum is 36.

The square root of 83217861 is about 9122.3824190833. The cubic root of 83217861 is about 436.5883903615.

The spelling of 83217861 in words is "eighty-three million, two hundred seventeen thousand, eight hundred sixty-one".