501266081 has 2 divisors, whose sum is σ = 501266082. Its totient is φ = 501266080.

The previous prime is 501266053. The next prime is 501266141. The reversal of 501266081 is 180662105.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 452838400 + 48427681 = 21280^2 + 6959^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-501266081 is a prime.

It is a super-2 number, since 2×501266081² = 502535367922197122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (501266011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 250633040 + 250633041.

It is an arithmetic number, because the mean of its divisors is an integer number (250633041).

Almost surely, 2^501266081 is an apocalyptic number.

It is an amenable number.

501266081 is a deficient number, since it is larger than the sum of its proper divisors (1).

501266081 is an equidigital number, since it uses as much as digits as its factorization.

501266081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2880, while the sum is 29.

The square root of 501266081 is about 22388.9723078126. The cubic root of 501266081 is about 794.3698874282.

The spelling of 501266081 in words is "five hundred one million, two hundred sixty-six thousand, eighty-one".