65724181 has 2 divisors, whose sum is σ = 65724182. Its totient is φ = 65724180.

The previous prime is 65724161. The next prime is 65724199. The reversal of 65724181 is 18142756.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 56927025 + 8797156 = 7545^2 + 2966^2 .

It is a cyclic number.

It is not a de Polignac number, because 65724181 - 2⁵ = 65724149 is a prime.

It is a super-2 number, since 2×65724181² = 8639335936241522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65724161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32862090 + 32862091.

It is an arithmetic number, because the mean of its divisors is an integer number (32862091).

Almost surely, 2^65724181 is an apocalyptic number.

It is an amenable number.

65724181 is a deficient number, since it is larger than the sum of its proper divisors (1).

65724181 is an equidigital number, since it uses as much as digits as its factorization.

65724181 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13440, while the sum is 34.

The square root of 65724181 is about 8107.0451460443. The cubic root of 65724181 is about 403.5602610860.

The spelling of 65724181 in words is "sixty-five million, seven hundred twenty-four thousand, one hundred eighty-one".