240781913 has 4 divisors (see below), whose sum is σ = 240850740. Its totient is φ = 240713088.

The previous prime is 240781873. The next prime is 240781939. The reversal of 240781913 is 319187042.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 20912329 + 219869584 = 4573^2 + 14828^2 .

It is a cyclic number.

It is not a de Polignac number, because 240781913 - 2¹⁰ = 240780889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (240781943) 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 in 3 ways as a sum of consecutive naturals, for example, 28868 + ... + 36261.

It is an arithmetic number, because the mean of its divisors is an integer number (60212685).

Almost surely, 2^240781913 is an apocalyptic number.

It is an amenable number.

240781913 is a deficient number, since it is larger than the sum of its proper divisors (68827).

240781913 is an equidigital number, since it uses as much as digits as its factorization.

240781913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68826.

The product of its (nonzero) digits is 12096, while the sum is 35.

The square root of 240781913 is about 15517.1489971580. The cubic root of 240781913 is about 622.1206544545.

The spelling of 240781913 in words is "two hundred forty million, seven hundred eighty-one thousand, nine hundred thirteen".