240066581 has 2 divisors, whose sum is σ = 240066582. Its totient is φ = 240066580.

The previous prime is 240066523. The next prime is 240066587. The reversal of 240066581 is 185660042.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 123965956 + 116100625 = 11134^2 + 10775^2 .

It is a cyclic number.

It is not a de Polignac number, because 240066581 - 2⁶ = 240066517 is a prime.

It is a super-2 number, since 2×240066581² = 115263926626059122, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (240066587) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 120033290 + 120033291.

It is an arithmetic number, because the mean of its divisors is an integer number (120033291).

Almost surely, 2^240066581 is an apocalyptic number.

It is an amenable number.

240066581 is a deficient number, since it is larger than the sum of its proper divisors (1).

240066581 is an equidigital number, since it uses as much as digits as its factorization.

240066581 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11520, while the sum is 32.

The square root of 240066581 is about 15494.0821283482. The cubic root of 240066581 is about 621.5039632794.

The spelling of 240066581 in words is "two hundred forty million, sixty-six thousand, five hundred eighty-one".