242319991 has 2 divisors, whose sum is σ = 242319992. Its totient is φ = 242319990.

The previous prime is 242319967. The next prime is 242320031. The reversal of 242319991 is 199913242.

It is an a-pointer prime, because the next prime (242320031) can be obtained adding 242319991 to its sum of digits (40).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 242319991 - 2¹³ = 242311799 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (242319941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121159995 + 121159996.

It is an arithmetic number, because the mean of its divisors is an integer number (121159996).

Almost surely, 2^242319991 is an apocalyptic number.

242319991 is a deficient number, since it is larger than the sum of its proper divisors (1).

242319991 is an equidigital number, since it uses as much as digits as its factorization.

242319991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 34992, while the sum is 40.

The square root of 242319991 is about 15566.6306887521. The cubic root of 242319991 is about 623.4425143254.

The spelling of 242319991 in words is "two hundred forty-two million, three hundred nineteen thousand, nine hundred ninety-one".