442161189 has 6 divisors (see below), whose sum is σ = 638677286. Its totient is φ = 294774120.

The previous prime is 442161151. The next prime is 442161197. The reversal of 442161189 is 981161244.

It can be written as a sum of positive squares in only one way, i.e., 436601025 + 5560164 = 20895^2 + 2358^2 .

It is not a de Polignac number, because 442161189 - 2¹¹ = 442159141 is a prime.

It is a super-4 number, since 4×442161189⁴ (a number of 36 digits) contains 4444 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 (442161119) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 24564502 + ... + 24564519.

Almost surely, 2^442161189 is an apocalyptic number.

It is an amenable number.

442161189 is a deficient number, since it is larger than the sum of its proper divisors (196516097).

442161189 is a wasteful number, since it uses less digits than its factorization.

442161189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49129027 (or 49129024 counting only the distinct ones).

The product of its digits is 13824, while the sum is 36.

The square root of 442161189 is about 21027.6291816267. The cubic root of 442161189 is about 761.8337465636.

The spelling of 442161189 in words is "four hundred forty-two million, one hundred sixty-one thousand, one hundred eighty-nine".