240809531 has 2 divisors, whose sum is σ = 240809532. Its totient is φ = 240809530.

The previous prime is 240809521. The next prime is 240809549. The reversal of 240809531 is 135908042.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 240809531 - 2⁶ = 240809467 is a prime.

It is a super-2 number, since 2×240809531² = 115978460440879922, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (240809501) 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, 120404765 + 120404766.

It is an arithmetic number, because the mean of its divisors is an integer number (120404766).

Almost surely, 2^240809531 is an apocalyptic number.

240809531 is a deficient number, since it is larger than the sum of its proper divisors (1).

240809531 is an equidigital number, since it uses as much as digits as its factorization.

240809531 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 240809531 is about 15518.0388902722. The cubic root of 240809531 is about 622.1444395624.

The spelling of 240809531 in words is "two hundred forty million, eight hundred nine thousand, five hundred thirty-one".