241908721 has 2 divisors, whose sum is σ = 241908722. Its totient is φ = 241908720.

The previous prime is 241908707. The next prime is 241908727. The reversal of 241908721 is 127809142.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 166410000 + 75498721 = 12900^2 + 8689^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-241908721 is a prime.

It is not a weakly prime, because it can be changed into another prime (241908727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 120954360 + 120954361.

It is an arithmetic number, because the mean of its divisors is an integer number (120954361).

Almost surely, 2^241908721 is an apocalyptic number.

It is an amenable number.

241908721 is a deficient number, since it is larger than the sum of its proper divisors (1).

241908721 is an equidigital number, since it uses as much as digits as its factorization.

241908721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8064, while the sum is 34.

The square root of 241908721 is about 15553.4150912267. The cubic root of 241908721 is about 623.0896085166.

The spelling of 241908721 in words is "two hundred forty-one million, nine hundred eight thousand, seven hundred twenty-one".