83749813 has 4 divisors (see below), whose sum is σ = 95714080. Its totient is φ = 71785548.

The previous prime is 83749811. The next prime is 83749829. The reversal of 83749813 is 31894738.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 83749813 - 2¹ = 83749811 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 83749813.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (83749811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5982123 + ... + 5982136.

It is an arithmetic number, because the mean of its divisors is an integer number (23928520).

Almost surely, 2^83749813 is an apocalyptic number.

It is an amenable number.

83749813 is a deficient number, since it is larger than the sum of its proper divisors (11964267).

83749813 is a wasteful number, since it uses less digits than its factorization.

83749813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11964266.

The product of its digits is 145152, while the sum is 43.

The square root of 83749813 is about 9151.4923919544. The cubic root of 83749813 is about 437.5166805069.

The spelling of 83749813 in words is "eighty-three million, seven hundred forty-nine thousand, eight hundred thirteen".