240715561 has 2 divisors, whose sum is σ = 240715562. Its totient is φ = 240715560.

The previous prime is 240715549. The next prime is 240715571. The reversal of 240715561 is 165517042.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 217857600 + 22857961 = 14760^2 + 4781^2 .

It is a cyclic number.

It is not a de Polignac number, because 240715561 - 2⁹ = 240715049 is a prime.

It is not a weakly prime, because it can be changed into another prime (240715571) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 120357780 + 120357781.

It is an arithmetic number, because the mean of its divisors is an integer number (120357781).

Almost surely, 2^240715561 is an apocalyptic number.

It is an amenable number.

240715561 is a deficient number, since it is larger than the sum of its proper divisors (1).

240715561 is an equidigital number, since it uses as much as digits as its factorization.

240715561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8400, while the sum is 31.

The square root of 240715561 is about 15515.0108282270. The cubic root of 240715561 is about 622.0635035090.

The spelling of 240715561 in words is "two hundred forty million, seven hundred fifteen thousand, five hundred sixty-one".