82899821 has 2 divisors, whose sum is σ = 82899822. Its totient is φ = 82899820.

The previous prime is 82899799. The next prime is 82899823. The reversal of 82899821 is 12899828.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 52041796 + 30858025 = 7214^2 + 5555^2 .

It is a cyclic number.

It is not a de Polignac number, because 82899821 - 2⁶ = 82899757 is a prime.

Together with 82899823, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (82899823) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41449910 + 41449911.

It is an arithmetic number, because the mean of its divisors is an integer number (41449911).

Almost surely, 2^82899821 is an apocalyptic number.

It is an amenable number.

82899821 is a deficient number, since it is larger than the sum of its proper divisors (1).

82899821 is an equidigital number, since it uses as much as digits as its factorization.

82899821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 165888, while the sum is 47.

The square root of 82899821 is about 9104.9338822421. The cubic root of 82899821 is about 436.0314993515.

The spelling of 82899821 in words is "eighty-two million, eight hundred ninety-nine thousand, eight hundred twenty-one".