83699681 has 4 divisors (see below), whose sum is σ = 90138132. Its totient is φ = 77261232.

The previous prime is 83699669. The next prime is 83699689. The reversal of 83699681 is 18699638.

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 4774225 + 78925456 = 2185^2 + 8884^2 .

It is a cyclic number.

It is not a de Polignac number, because 83699681 - 2²⁶ = 16590817 is a prime.

It is a super-2 number, since 2×83699681² = 14011273199003522, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (83699689) 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, 3219206 + ... + 3219231.

It is an arithmetic number, because the mean of its divisors is an integer number (22534533).

Almost surely, 2^83699681 is an apocalyptic number.

It is an amenable number.

83699681 is a deficient number, since it is larger than the sum of its proper divisors (6438451).

83699681 is a wasteful number, since it uses less digits than its factorization.

83699681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6438450.

The product of its digits is 559872, while the sum is 50.

The square root of 83699681 is about 9148.7529751327. The cubic root of 83699681 is about 437.4293650319.

The spelling of 83699681 in words is "eighty-three million, six hundred ninety-nine thousand, six hundred eighty-one".