242212309 has 2 divisors, whose sum is σ = 242212310. Its totient is φ = 242212308.

The previous prime is 242212307. The next prime is 242212339. The reversal of 242212309 is 903212242.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 145878084 + 96334225 = 12078^2 + 9815^2 .

It is a cyclic number.

It is not a de Polignac number, because 242212309 - 2¹ = 242212307 is a prime.

It is a super-2 number, since 2×242212309² = 117333605262222962, which contains 22 as substring.

Together with 242212307, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (242212307) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121106154 + 121106155.

It is an arithmetic number, because the mean of its divisors is an integer number (121106155).

Almost surely, 2^242212309 is an apocalyptic number.

It is an amenable number.

242212309 is a deficient number, since it is larger than the sum of its proper divisors (1).

242212309 is an equidigital number, since it uses as much as digits as its factorization.

242212309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 242212309 is about 15563.1715598075. The cubic root of 242212309 is about 623.3501523164.

The spelling of 242212309 in words is "two hundred forty-two million, two hundred twelve thousand, three hundred nine".