242455643 has 4 divisors (see below), whose sum is σ = 242503080. Its totient is φ = 242408208.

The previous prime is 242455621. The next prime is 242455691. The reversal of 242455643 is 346554242.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 346554242 = 2 ⋅173277121.

It is a cyclic number.

It is not a de Polignac number, because 242455643 - 2¹⁶ = 242390107 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (242455693) 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, 14978 + ... + 26631.

It is an arithmetic number, because the mean of its divisors is an integer number (60625770).

Almost surely, 2^242455643 is an apocalyptic number.

242455643 is a deficient number, since it is larger than the sum of its proper divisors (47437).

242455643 is an equidigital number, since it uses as much as digits as its factorization.

242455643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47436.

The product of its digits is 115200, while the sum is 35.

The square root of 242455643 is about 15570.9872198265. The cubic root of 242455643 is about 623.5588280852.

The spelling of 242455643 in words is "two hundred forty-two million, four hundred fifty-five thousand, six hundred forty-three".