242398981 has 4 divisors (see below), whose sum is σ = 264435264. Its totient is φ = 220362700.

The previous prime is 242398973. The next prime is 242398991. The reversal of 242398981 is 189893242.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 242398981 - 2³ = 242398973 is a prime.

It is a super-3 number, since 3×242398981³ (a number of 26 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (242398901) 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, 11018125 + ... + 11018146.

It is an arithmetic number, because the mean of its divisors is an integer number (66108816).

Almost surely, 2^242398981 is an apocalyptic number.

It is an amenable number.

242398981 is a deficient number, since it is larger than the sum of its proper divisors (22036283).

242398981 is a wasteful number, since it uses less digits than its factorization.

242398981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22036282.

The product of its digits is 248832, while the sum is 46.

The square root of 242398981 is about 15569.1676399222. The cubic root of 242398981 is about 623.5102489684.

The spelling of 242398981 in words is "two hundred forty-two million, three hundred ninety-eight thousand, nine hundred eighty-one".