82721941 has 2 divisors, whose sum is σ = 82721942. Its totient is φ = 82721940.

The previous prime is 82721911. The next prime is 82721959. The reversal of 82721941 is 14912728.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 82719025 + 2916 = 9095^2 + 54^2 .

It is a cyclic number.

It is not a de Polignac number, because 82721941 - 2²⁵ = 49167509 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 82721897 and 82721906.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (82721911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41360970 + 41360971.

It is an arithmetic number, because the mean of its divisors is an integer number (41360971).

Almost surely, 2^82721941 is an apocalyptic number.

It is an amenable number.

82721941 is a deficient number, since it is larger than the sum of its proper divisors (1).

82721941 is an equidigital number, since it uses as much as digits as its factorization.

82721941 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8064, while the sum is 34.

The square root of 82721941 is about 9095.1603064487. The cubic root of 82721941 is about 435.7194085115.

The spelling of 82721941 in words is "eighty-two million, seven hundred twenty-one thousand, nine hundred forty-one".