242889451 has 4 divisors (see below), whose sum is σ = 277587952. Its totient is φ = 208190952.

The previous prime is 242889403. The next prime is 242889461. The reversal of 242889451 is 154988242.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 154988242 = 2 ⋅77494121.

It is a cyclic number.

It is not a de Polignac number, because 242889451 - 2¹³ = 242881259 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 242889398 and 242889407.

It is not an unprimeable number, because it can be changed into a prime (242889461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17349240 + ... + 17349253.

It is an arithmetic number, because the mean of its divisors is an integer number (69396988).

Almost surely, 2^242889451 is an apocalyptic number.

242889451 is a deficient number, since it is larger than the sum of its proper divisors (34698501).

242889451 is an equidigital number, since it uses as much as digits as its factorization.

242889451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34698500.

The product of its digits is 184320, while the sum is 43.

The square root of 242889451 is about 15584.9110039166. The cubic root of 242889451 is about 623.9305024439.

The spelling of 242889451 in words is "two hundred forty-two million, eight hundred eighty-nine thousand, four hundred fifty-one".