242309591 has 2 divisors, whose sum is σ = 242309592. Its totient is φ = 242309590.

The previous prime is 242309567. The next prime is 242309597. The reversal of 242309591 is 195903242.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 242309591 - 2¹⁰ = 242308567 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (242309597) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121154795 + 121154796.

It is an arithmetic number, because the mean of its divisors is an integer number (121154796).

Almost surely, 2^242309591 is an apocalyptic number.

242309591 is a deficient number, since it is larger than the sum of its proper divisors (1).

242309591 is an equidigital number, since it uses as much as digits as its factorization.

242309591 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 19440, while the sum is 35.

The square root of 242309591 is about 15566.2966372866. The cubic root of 242309591 is about 623.4335951343.

The spelling of 242309591 in words is "two hundred forty-two million, three hundred nine thousand, five hundred ninety-one".