242615621 has 2 divisors, whose sum is σ = 242615622. Its totient is φ = 242615620.

The previous prime is 242615603. The next prime is 242615627. The reversal of 242615621 is 126516242.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 200222500 + 42393121 = 14150^2 + 6511^2 .

It is a cyclic number.

It is not a de Polignac number, because 242615621 - 2¹⁸ = 242353477 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (242615627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121307810 + 121307811.

It is an arithmetic number, because the mean of its divisors is an integer number (121307811).

Almost surely, 2^242615621 is an apocalyptic number.

It is an amenable number.

242615621 is a deficient number, since it is larger than the sum of its proper divisors (1).

242615621 is an equidigital number, since it uses as much as digits as its factorization.

242615621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5760, while the sum is 29.

The square root of 242615621 is about 15576.1234265783. The cubic root of 242615621 is about 623.6959442475.

The spelling of 242615621 in words is "two hundred forty-two million, six hundred fifteen thousand, six hundred twenty-one".