242997281 has 2 divisors, whose sum is σ = 242997282. Its totient is φ = 242997280.

The previous prime is 242997239. The next prime is 242997353. The reversal of 242997281 is 182799242.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 135024400 + 107972881 = 11620^2 + 10391^2 .

It is a cyclic number.

It is not a de Polignac number, because 242997281 - 2¹⁴ = 242980897 is a prime.

It is a super-2 number, since 2×242997281² = 118095357146785922, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (242997581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121498640 + 121498641.

It is an arithmetic number, because the mean of its divisors is an integer number (121498641).

Almost surely, 2^242997281 is an apocalyptic number.

It is an amenable number.

242997281 is a deficient number, since it is larger than the sum of its proper divisors (1).

242997281 is an equidigital number, since it uses as much as digits as its factorization.

242997281 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 145152, while the sum is 44.

The square root of 242997281 is about 15588.3700559103. The cubic root of 242997281 is about 624.0228194386.

The spelling of 242997281 in words is "two hundred forty-two million, nine hundred ninety-seven thousand, two hundred eighty-one".