82239901 has 2 divisors, whose sum is σ = 82239902. Its totient is φ = 82239900.

The previous prime is 82239893. The next prime is 82239917. The reversal of 82239901 is 10993228.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 43164900 + 39075001 = 6570^2 + 6251^2 .

It is a cyclic number.

It is not a de Polignac number, because 82239901 - 2³ = 82239893 is a prime.

It is equal to p_4792570 and since 82239901 and 4792570 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (82239991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41119950 + 41119951.

It is an arithmetic number, because the mean of its divisors is an integer number (41119951).

Almost surely, 2^82239901 is an apocalyptic number.

82239901 is the 5736-th centered pentagonal number.

It is an amenable number.

82239901 is a deficient number, since it is larger than the sum of its proper divisors (1).

82239901 is an equidigital number, since it uses as much as digits as its factorization.

82239901 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7776, while the sum is 34.

The square root of 82239901 is about 9068.6217806236. The cubic root of 82239901 is about 434.8714130876.

The spelling of 82239901 in words is "eighty-two million, two hundred thirty-nine thousand, nine hundred one".