240978581 has 2 divisors, whose sum is σ = 240978582. Its totient is φ = 240978580.

The previous prime is 240978547. The next prime is 240978589. The reversal of 240978581 is 185879042.

240978581 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 228312100 + 12666481 = 15110^2 + 3559^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-240978581 is a prime.

It is a super-2 number, since 2×240978581² = 116141353001547122, 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 (240978589) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 120489290 + 120489291.

It is an arithmetic number, because the mean of its divisors is an integer number (120489291).

Almost surely, 2^240978581 is an apocalyptic number.

It is an amenable number.

240978581 is a deficient number, since it is larger than the sum of its proper divisors (1).

240978581 is an equidigital number, since it uses as much as digits as its factorization.

240978581 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 161280, while the sum is 44.

The square root of 240978581 is about 15523.4848213924. The cubic root of 240978581 is about 622.2899887797.

The spelling of 240978581 in words is "two hundred forty million, nine hundred seventy-eight thousand, five hundred eighty-one".