240969991 has 4 divisors (see below), whose sum is σ = 241069752. Its totient is φ = 240870232.

The previous prime is 240969977. The next prime is 240970001. The reversal of 240969991 is 199969042.

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

It is a cyclic number.

It is not a de Polignac number, because 240969991 - 2¹¹ = 240967943 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (240969791) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46165 + ... + 51118.

It is an arithmetic number, because the mean of its divisors is an integer number (60267438).

Almost surely, 2^240969991 is an apocalyptic number.

240969991 is a deficient number, since it is larger than the sum of its proper divisors (99761).

240969991 is an equidigital number, since it uses as much as digits as its factorization.

240969991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99760.

The product of its (nonzero) digits is 314928, while the sum is 49.

The square root of 240969991 is about 15523.2081413605. The cubic root of 240969991 is about 622.2825945755.

The spelling of 240969991 in words is "two hundred forty million, nine hundred sixty-nine thousand, nine hundred ninety-one".