83991451 has 4 divisors (see below), whose sum is σ = 84092400. Its totient is φ = 83890504.

The previous prime is 83991437. The next prime is 83991461. The reversal of 83991451 is 15419938.

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

It is a cyclic number.

It is not a de Polignac number, because 83991451 - 2²⁵ = 50437019 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (83991461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49216 + ... + 50893.

It is an arithmetic number, because the mean of its divisors is an integer number (21023100).

Almost surely, 2^83991451 is an apocalyptic number.

83991451 is a deficient number, since it is larger than the sum of its proper divisors (100949).

83991451 is a wasteful number, since it uses less digits than its factorization.

83991451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100948.

The product of its digits is 38880, while the sum is 40.

The square root of 83991451 is about 9164.6849918587. The cubic root of 83991451 is about 437.9370561398.

The spelling of 83991451 in words is "eighty-three million, nine hundred ninety-one thousand, four hundred fifty-one".