240658991 has 2 divisors, whose sum is σ = 240658992. Its totient is φ = 240658990.

The previous prime is 240658961. The next prime is 240658993. The reversal of 240658991 is 199856042.

240658991 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 is a cyclic number.

It is not a de Polignac number, because 240658991 - 2⁶ = 240658927 is a prime.

Together with 240658993, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (240658993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 120329495 + 120329496.

It is an arithmetic number, because the mean of its divisors is an integer number (120329496).

Almost surely, 2^240658991 is an apocalyptic number.

240658991 is a deficient number, since it is larger than the sum of its proper divisors (1).

240658991 is an equidigital number, since it uses as much as digits as its factorization.

240658991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 155520, while the sum is 44.

The square root of 240658991 is about 15513.1876479336. The cubic root of 240658991 is about 622.0147697957.

The spelling of 240658991 in words is "two hundred forty million, six hundred fifty-eight thousand, nine hundred ninety-one".