83516621 has 16 divisors (see below), whose sum is σ = 87595200. Its totient is φ = 79567488.

The previous prime is 83516617. The next prime is 83516651. The reversal of 83516621 is 12661538.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 83516621 - 2² = 83516617 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 (83516651) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 531875 + ... + 532031.

It is an arithmetic number, because the mean of its divisors is an integer number (5474700).

Almost surely, 2^83516621 is an apocalyptic number.

It is an amenable number.

83516621 is a deficient number, since it is larger than the sum of its proper divisors (4078579).

83516621 is a wasteful number, since it uses less digits than its factorization.

83516621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 428.

The product of its digits is 8640, while the sum is 32.

The square root of 83516621 is about 9138.7428566516. The cubic root of 83516621 is about 437.1102309256.

The spelling of 83516621 in words is "eighty-three million, five hundred sixteen thousand, six hundred twenty-one".