242981251 has 4 divisors (see below), whose sum is σ = 243147904. Its totient is φ = 242814600.

The previous prime is 242981243. The next prime is 242981273. The reversal of 242981251 is 152189242.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 152189242 = 2 ⋅76094621.

It is a cyclic number.

It is not a de Polignac number, because 242981251 - 2³ = 242981243 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (242981201) 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, 81120 + ... + 84061.

It is an arithmetic number, because the mean of its divisors is an integer number (60786976).

Almost surely, 2^242981251 is an apocalyptic number.

242981251 is a deficient number, since it is larger than the sum of its proper divisors (166653).

242981251 is a wasteful number, since it uses less digits than its factorization.

242981251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166652.

The product of its digits is 11520, while the sum is 34.

The square root of 242981251 is about 15587.8558820641. The cubic root of 242981251 is about 624.0090973293.

The spelling of 242981251 in words is "two hundred forty-two million, nine hundred eighty-one thousand, two hundred fifty-one".