242001581 has 2 divisors, whose sum is σ = 242001582. Its totient is φ = 242001580.

The previous prime is 242001563. The next prime is 242001611. The reversal of 242001581 is 185100242.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 154878025 + 87123556 = 12445^2 + 9334^2 .

It is a cyclic number.

It is not a de Polignac number, because 242001581 - 2²⁶ = 174892717 is a prime.

It is a super-2 number, since 2×242001581² = 117129530412999122, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (242003581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121000790 + 121000791.

It is an arithmetic number, because the mean of its divisors is an integer number (121000791).

Almost surely, 2^242001581 is an apocalyptic number.

It is an amenable number.

242001581 is a deficient number, since it is larger than the sum of its proper divisors (1).

242001581 is an equidigital number, since it uses as much as digits as its factorization.

242001581 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 640, while the sum is 23.

The square root of 242001581 is about 15556.4000012856. The cubic root of 242001581 is about 623.1693254981.

The spelling of 242001581 in words is "two hundred forty-two million, one thousand, five hundred eighty-one".