82219381 has 4 divisors (see below), whose sum is σ = 82484064. Its totient is φ = 81954700.

The previous prime is 82219373. The next prime is 82219421. The reversal of 82219381 is 18391228.

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 82219381 - 2³ = 82219373 is a prime.

It is a super-2 number, since 2×82219381² = 13520053224046322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82219301) 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, 131875 + ... + 132496.

It is an arithmetic number, because the mean of its divisors is an integer number (20621016).

Almost surely, 2^82219381 is an apocalyptic number.

It is an amenable number.

82219381 is a deficient number, since it is larger than the sum of its proper divisors (264683).

82219381 is a wasteful number, since it uses less digits than its factorization.

82219381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 264682.

The product of its digits is 6912, while the sum is 34.

The square root of 82219381 is about 9067.4903363610. The cubic root of 82219381 is about 434.8352412554.

The spelling of 82219381 in words is "eighty-two million, two hundred nineteen thousand, three hundred eighty-one".