242098991 has 4 divisors (see below), whose sum is σ = 242213184. Its totient is φ = 241984800.

The previous prime is 242098981. The next prime is 242098999. The reversal of 242098991 is 199890242.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-242098991 is a prime.

It is a super-2 number, since 2×242098991² = 117223842886436162, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (242098999) 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, 53855 + ... + 58176.

It is an arithmetic number, because the mean of its divisors is an integer number (60553296).

Almost surely, 2^242098991 is an apocalyptic number.

242098991 is a deficient number, since it is larger than the sum of its proper divisors (114193).

242098991 is a wasteful number, since it uses less digits than its factorization.

242098991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114192.

The product of its (nonzero) digits is 93312, while the sum is 44.

The square root of 242098991 is about 15559.5305520443. The cubic root of 242098991 is about 623.2529265789.

The spelling of 242098991 in words is "two hundred forty-two million, ninety-eight thousand, nine hundred ninety-one".