242440981 has 2 divisors, whose sum is σ = 242440982. Its totient is φ = 242440980.

The previous prime is 242440973. The next prime is 242441011. The reversal of 242440981 is 189044242.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 242300356 + 140625 = 15566^2 + 375^2 .

It is a cyclic number.

It is not a de Polignac number, because 242440981 - 2³ = 242440973 is a prime.

It is a super-2 number, since 2×242440981² = 117555258536484722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (242440951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121220490 + 121220491.

It is an arithmetic number, because the mean of its divisors is an integer number (121220491).

Almost surely, 2^242440981 is an apocalyptic number.

It is an amenable number.

242440981 is a deficient number, since it is larger than the sum of its proper divisors (1).

242440981 is an equidigital number, since it uses as much as digits as its factorization.

242440981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18432, while the sum is 34.

The square root of 242440981 is about 15570.5164011988. The cubic root of 242440981 is about 623.5462583581.

The spelling of 242440981 in words is "two hundred forty-two million, four hundred forty thousand, nine hundred eighty-one".