83021813 has 8 divisors (see below), whose sum is σ = 97943040. Its totient is φ = 68865840.

The previous prime is 83021759. The next prime is 83021839. The reversal of 83021813 is 31812038.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 83021813 - 2⁶ = 83021749 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (83021893) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 191078 + ... + 191511.

It is an arithmetic number, because the mean of its divisors is an integer number (12242880).

Almost surely, 2^83021813 is an apocalyptic number.

It is an amenable number.

83021813 is a deficient number, since it is larger than the sum of its proper divisors (14921227).

83021813 is a wasteful number, since it uses less digits than its factorization.

83021813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 382627.

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 83021813 is about 9111.6306444017. The cubic root of 83021813 is about 436.2452765886.

The spelling of 83021813 in words is "eighty-three million, twenty-one thousand, eight hundred thirteen".