242936891 has 4 divisors (see below), whose sum is σ = 243161472. Its totient is φ = 242712312.

The previous prime is 242936887. The next prime is 242936899. The reversal of 242936891 is 198639242.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 198639242 = 2 ⋅99319621.

It is a cyclic number.

It is not a de Polignac number, because 242936891 - 2² = 242936887 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (242936899) 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, 110660 + ... + 112833.

It is an arithmetic number, because the mean of its divisors is an integer number (60790368).

Almost surely, 2^242936891 is an apocalyptic number.

242936891 is a deficient number, since it is larger than the sum of its proper divisors (224581).

242936891 is a wasteful number, since it uses less digits than its factorization.

242936891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 224580.

The product of its digits is 186624, while the sum is 44.

The square root of 242936891 is about 15586.4329145575. The cubic root of 242936891 is about 623.9711208350.

It can be divided in two parts, 242 and 936891, that multiplied together give a palindrome (226727622).

The spelling of 242936891 in words is "two hundred forty-two million, nine hundred thirty-six thousand, eight hundred ninety-one".