83917681 has 4 divisors (see below), whose sum is σ = 83968164. Its totient is φ = 83867200.

The previous prime is 83917679. The next prime is 83917711. The reversal of 83917681 is 18671938.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 73805281 + 10112400 = 8591^2 + 3180^2 .

It is a cyclic number.

It is not a de Polignac number, because 83917681 - 2¹ = 83917679 is a prime.

It is a super-2 number, since 2×83917681² = 14084354368835522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (83917601) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22660 + ... + 26101.

It is an arithmetic number, because the mean of its divisors is an integer number (20992041).

Almost surely, 2^83917681 is an apocalyptic number.

It is an amenable number.

83917681 is a deficient number, since it is larger than the sum of its proper divisors (50483).

83917681 is a wasteful number, since it uses less digits than its factorization.

83917681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50482.

The product of its digits is 72576, while the sum is 43.

The square root of 83917681 is about 9160.6594194960. The cubic root of 83917681 is about 437.8088046761.

It can be divided in two parts, 83 and 917681, that added together give a square (917764 = 958²).

The spelling of 83917681 in words is "eighty-three million, nine hundred seventeen thousand, six hundred eighty-one".