83856521 has 8 divisors (see below), whose sum is σ = 98173824. Its totient is φ = 70123680.

The previous prime is 83856499. The next prime is 83856527. The reversal of 83856521 is 12565838.

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

It is a cyclic number.

It is not a de Polignac number, because 83856521 - 2¹⁸ = 83594377 is a prime.

It is a super-2 number, since 2×83856521² = 14063832228446882, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is not an unprimeable number, because it can be changed into a prime (83856527) 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, 145805 + ... + 146378.

It is an arithmetic number, because the mean of its divisors is an integer number (12271728).

Almost surely, 2^83856521 is an apocalyptic number.

It is an amenable number.

83856521 is a deficient number, since it is larger than the sum of its proper divisors (14317303).

83856521 is a wasteful number, since it uses less digits than its factorization.

83856521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 292231.

The product of its digits is 57600, while the sum is 38.

The square root of 83856521 is about 9157.3206234138. The cubic root of 83856521 is about 437.7024190938.

The spelling of 83856521 in words is "eighty-three million, eight hundred fifty-six thousand, five hundred twenty-one".