242587181 has 2 divisors, whose sum is σ = 242587182. Its totient is φ = 242587180.

The previous prime is 242587139. The next prime is 242587199. The reversal of 242587181 is 181785242.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 148011556 + 94575625 = 12166^2 + 9725^2 .

It is a cyclic number.

It is not a de Polignac number, because 242587181 - 2¹⁸ = 242325037 is a prime.

It is a super-2 number, since 2×242587181² = 117697080771053522, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (242580181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121293590 + 121293591.

It is an arithmetic number, because the mean of its divisors is an integer number (121293591).

Almost surely, 2^242587181 is an apocalyptic number.

It is an amenable number.

242587181 is a deficient number, since it is larger than the sum of its proper divisors (1).

242587181 is an equidigital number, since it uses as much as digits as its factorization.

242587181 is an evil number, because the sum of its binary digits is even.

The product of its digits is 35840, while the sum is 38.

The square root of 242587181 is about 15575.2104640676. The cubic root of 242587181 is about 623.6715729041.

The spelling of 242587181 in words is "two hundred forty-two million, five hundred eighty-seven thousand, one hundred eighty-one".