81838241 has 2 divisors, whose sum is σ = 81838242. Its totient is φ = 81838240.

The previous prime is 81838231. The next prime is 81838247. The reversal of 81838241 is 14283818.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 52635025 + 29203216 = 7255^2 + 5404^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81838241 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (81838247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40919120 + 40919121.

It is an arithmetic number, because the mean of its divisors is an integer number (40919121).

Almost surely, 2^81838241 is an apocalyptic number.

It is an amenable number.

81838241 is a deficient number, since it is larger than the sum of its proper divisors (1).

81838241 is an equidigital number, since it uses as much as digits as its factorization.

81838241 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12288, while the sum is 35.

The square root of 81838241 is about 9046.4490823748. The cubic root of 81838241 is about 434.1622861412.

The spelling of 81838241 in words is "eighty-one million, eight hundred thirty-eight thousand, two hundred forty-one".