242775409 has 2 divisors, whose sum is σ = 242775410. Its totient is φ = 242775408.

The previous prime is 242775361. The next prime is 242775433. The reversal of 242775409 is 904577242.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 236298384 + 6477025 = 15372^2 + 2545^2 .

It is a cyclic number.

It is not a de Polignac number, because 242775409 - 2⁹ = 242774897 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (242775469) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121387704 + 121387705.

It is an arithmetic number, because the mean of its divisors is an integer number (121387705).

Almost surely, 2^242775409 is an apocalyptic number.

It is an amenable number.

242775409 is a deficient number, since it is larger than the sum of its proper divisors (1).

242775409 is an equidigital number, since it uses as much as digits as its factorization.

242775409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 141120, while the sum is 40.

The square root of 242775409 is about 15581.2518431607. The cubic root of 242775409 is about 623.8328374072.

The spelling of 242775409 in words is "two hundred forty-two million, seven hundred seventy-five thousand, four hundred nine".