242493521 has 2 divisors, whose sum is σ = 242493522. Its totient is φ = 242493520.

The previous prime is 242493487. The next prime is 242493533. The reversal of 242493521 is 125394242.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 155351296 + 87142225 = 12464^2 + 9335^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-242493521 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (242493571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121246760 + 121246761.

It is an arithmetic number, because the mean of its divisors is an integer number (121246761).

Almost surely, 2^242493521 is an apocalyptic number.

It is an amenable number.

242493521 is a deficient number, since it is larger than the sum of its proper divisors (1).

242493521 is an equidigital number, since it uses as much as digits as its factorization.

242493521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17280, while the sum is 32.

The square root of 242493521 is about 15572.2034728551. The cubic root of 242493521 is about 623.5912985351.

The spelling of 242493521 in words is "two hundred forty-two million, four hundred ninety-three thousand, five hundred twenty-one".