241999991 has 2 divisors, whose sum is σ = 241999992. Its totient is φ = 241999990.

The previous prime is 241999949. The next prime is 242000023. The reversal of 241999991 is 199999142.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 241999991 - 2¹⁴ = 241983607 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (241999931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 120999995 + 120999996.

It is an arithmetic number, because the mean of its divisors is an integer number (120999996).

Almost surely, 2^241999991 is an apocalyptic number.

241999991 is a deficient number, since it is larger than the sum of its proper divisors (1).

241999991 is an equidigital number, since it uses as much as digits as its factorization.

241999991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 472392, while the sum is 53.

The square root of 241999991 is about 15556.3488968331. The cubic root of 241999991 is about 623.1679607118.

The spelling of 241999991 in words is "two hundred forty-one million, nine hundred ninety-nine thousand, nine hundred ninety-one".