240687121 has 2 divisors, whose sum is σ = 240687122. Its totient is φ = 240687120.

The previous prime is 240687119. The next prime is 240687169. The reversal of 240687121 is 121786042.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 215032896 + 25654225 = 14664^2 + 5065^2 .

It is a cyclic number.

It is not a de Polignac number, because 240687121 - 2¹ = 240687119 is a prime.

Together with 240687119, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (240687721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 120343560 + 120343561.

It is an arithmetic number, because the mean of its divisors is an integer number (120343561).

Almost surely, 2^240687121 is an apocalyptic number.

It is an amenable number.

240687121 is a deficient number, since it is larger than the sum of its proper divisors (1).

240687121 is an equidigital number, since it uses as much as digits as its factorization.

240687121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5376, while the sum is 31.

The square root of 240687121 is about 15514.0942694055. The cubic root of 240687121 is about 622.0390040780.

The spelling of 240687121 in words is "two hundred forty million, six hundred eighty-seven thousand, one hundred twenty-one".