242554621 has 2 divisors, whose sum is σ = 242554622. Its totient is φ = 242554620.

The previous prime is 242554607. The next prime is 242554649. The reversal of 242554621 is 126455242.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 221265625 + 21288996 = 14875^2 + 4614^2 .

It is a cyclic number.

It is not a de Polignac number, because 242554621 - 2¹¹ = 242552573 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (242554421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121277310 + 121277311.

It is an arithmetic number, because the mean of its divisors is an integer number (121277311).

Almost surely, 2^242554621 is an apocalyptic number.

It is an amenable number.

242554621 is a deficient number, since it is larger than the sum of its proper divisors (1).

242554621 is an equidigital number, since it uses as much as digits as its factorization.

242554621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 19200, while the sum is 31.

The square root of 242554621 is about 15574.1651782688. The cubic root of 242554621 is about 623.6436686336.

The spelling of 242554621 in words is "two hundred forty-two million, five hundred fifty-four thousand, six hundred twenty-one".