242189645 has 4 divisors (see below), whose sum is σ = 290627580. Its totient is φ = 193751712.

The previous prime is 242189641. The next prime is 242189659. The reversal of 242189645 is 546981242.

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

It can be written as a sum of positive squares in 2 ways, for example, as 111978724 + 130210921 = 10582^2 + 11411^2 .

It is a cyclic number.

It is not a de Polignac number, because 242189645 - 2² = 242189641 is a prime.

It is a super-3 number, since 3×242189645³ (a number of 26 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (242189641) 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, 24218960 + ... + 24218969.

It is an arithmetic number, because the mean of its divisors is an integer number (72656895).

Almost surely, 2^242189645 is an apocalyptic number.

It is an amenable number.

242189645 is a deficient number, since it is larger than the sum of its proper divisors (48437935).

242189645 is an equidigital number, since it uses as much as digits as its factorization.

242189645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48437934.

The product of its digits is 138240, while the sum is 41.

The square root of 242189645 is about 15562.4434135517. The cubic root of 242189645 is about 623.3307092521.

The spelling of 242189645 in words is "two hundred forty-two million, one hundred eighty-nine thousand, six hundred forty-five".