242981 has 4 divisors (see below), whose sum is σ = 257292. Its totient is φ = 228672.

The previous prime is 242971. The next prime is 242989. The reversal of 242981 is 189242.

242981 = T₇₁ + T₇₂ + ... + T₁₂₁.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 189242 = 2 ⋅94621.

It can be written as a sum of positive squares in 2 ways, for example, as 70756 + 172225 = 266^2 + 415^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-242981 is a prime.

It is a super-2 number, since 2×242981² = 118079532722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 242981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (242989) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7130 + ... + 7163.

It is an arithmetic number, because the mean of its divisors is an integer number (64323).

2²⁴²⁹⁸¹ is an apocalyptic number.

It is an amenable number.

242981 is a deficient number, since it is larger than the sum of its proper divisors (14311).

242981 is a wasteful number, since it uses less digits than its factorization.

242981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14310.

The product of its digits is 1152, while the sum is 26.

The square root of 242981 is about 492.9310296583. The cubic root of 242981 is about 62.4008882462.

The spelling of 242981 in words is "two hundred forty-two thousand, nine hundred eighty-one".