83213791 has 4 divisors (see below), whose sum is σ = 83577400. Its totient is φ = 82850184.

The previous prime is 83213783. The next prime is 83213797. The reversal of 83213791 is 19731238.

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 83213791 - 2³ = 83213783 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (83213797) 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, 181461 + ... + 181918.

It is an arithmetic number, because the mean of its divisors is an integer number (20894350).

Almost surely, 2^83213791 is an apocalyptic number.

83213791 is a deficient number, since it is larger than the sum of its proper divisors (363609).

83213791 is a wasteful number, since it uses less digits than its factorization.

83213791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 363608.

The product of its digits is 9072, while the sum is 34.

The square root of 83213791 is about 9122.1593386654. The cubic root of 83213791 is about 436.5812727240.

The spelling of 83213791 in words is "eighty-three million, two hundred thirteen thousand, seven hundred ninety-one".