83691653 has 4 divisors (see below), whose sum is σ = 84838188. Its totient is φ = 82545120.

The previous prime is 83691613. The next prime is 83691659. The reversal of 83691653 is 35619638.

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 18679684 + 65011969 = 4322^2 + 8063^2 .

It is a cyclic number.

It is not a de Polignac number, because 83691653 - 2⁶ = 83691589 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 83691653.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (83691659) 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, 573158 + ... + 573303.

It is an arithmetic number, because the mean of its divisors is an integer number (21209547).

Almost surely, 2^83691653 is an apocalyptic number.

It is an amenable number.

83691653 is a deficient number, since it is larger than the sum of its proper divisors (1146535).

83691653 is a wasteful number, since it uses less digits than its factorization.

83691653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1146534.

The product of its digits is 116640, while the sum is 41.

The square root of 83691653 is about 9148.3142162914. The cubic root of 83691653 is about 437.4153793345.

The spelling of 83691653 in words is "eighty-three million, six hundred ninety-one thousand, six hundred fifty-three".