82995221 has 2 divisors, whose sum is σ = 82995222. Its totient is φ = 82995220.

The previous prime is 82995217. The next prime is 82995257. The reversal of 82995221 is 12259928.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 43744996 + 39250225 = 6614^2 + 6265^2 .

It is a cyclic number.

It is not a de Polignac number, because 82995221 - 2² = 82995217 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (82995281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41497610 + 41497611.

It is an arithmetic number, because the mean of its divisors is an integer number (41497611).

Almost surely, 2^82995221 is an apocalyptic number.

It is an amenable number.

82995221 is a deficient number, since it is larger than the sum of its proper divisors (1).

82995221 is an equidigital number, since it uses as much as digits as its factorization.

82995221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25920, while the sum is 38.

The square root of 82995221 is about 9110.1712936695. The cubic root of 82995221 is about 436.1986949624.

The spelling of 82995221 in words is "eighty-two million, nine hundred ninety-five thousand, two hundred twenty-one".