81752849 has 2 divisors, whose sum is σ = 81752850. Its totient is φ = 81752848.

The previous prime is 81752831. The next prime is 81752863. The reversal of 81752849 is 94825718.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 60528400 + 21224449 = 7780^2 + 4607^2 .

It is a cyclic number.

It is not a de Polignac number, because 81752849 - 2²⁴ = 64975633 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (81752809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40876424 + 40876425.

It is an arithmetic number, because the mean of its divisors is an integer number (40876425).

Almost surely, 2^81752849 is an apocalyptic number.

It is an amenable number.

81752849 is a deficient number, since it is larger than the sum of its proper divisors (1).

81752849 is an equidigital number, since it uses as much as digits as its factorization.

81752849 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 161280, while the sum is 44.

The square root of 81752849 is about 9041.7282086999. The cubic root of 81752849 is about 434.0112284466.

The spelling of 81752849 in words is "eighty-one million, seven hundred fifty-two thousand, eight hundred forty-nine".