82721959 has 2 divisors, whose sum is σ = 82721960. Its totient is φ = 82721958.

The previous prime is 82721941. The next prime is 82721987. The reversal of 82721959 is 95912728.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 82721959 - 2¹¹ = 82719911 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (82721759) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41360979 + 41360980.

It is an arithmetic number, because the mean of its divisors is an integer number (41360980).

Almost surely, 2^82721959 is an apocalyptic number.

82721959 is a deficient number, since it is larger than the sum of its proper divisors (1).

82721959 is an equidigital number, since it uses as much as digits as its factorization.

82721959 is an evil number, because the sum of its binary digits is even.

The product of its digits is 90720, while the sum is 43.

The square root of 82721959 is about 9095.1612959859. The cubic root of 82721959 is about 435.7194401151.

The spelling of 82721959 in words is "eighty-two million, seven hundred twenty-one thousand, nine hundred fifty-nine".