165631442 has 32 divisors (see below), whose sum is σ = 271035072. Its totient is φ = 75608064.

The previous prime is 165631439. The next prime is 165631457. The reversal of 165631442 is 244136561.

It is a junction number, because it is equal to n+sod(n) for n = 165631399 and 165631408.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 281873 + ... + 282459.

It is an arithmetic number, because the mean of its divisors is an integer number (8469846).

Almost surely, 2^165631442 is an apocalyptic number.

165631442 is a deficient number, since it is larger than the sum of its proper divisors (105403630).

165631442 is a wasteful number, since it uses less digits than its factorization.

165631442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 842.

The product of its digits is 17280, while the sum is 32.

The square root of 165631442 is about 12869.7879547411. The cubic root of 165631442 is about 549.1794287009.

The spelling of 165631442 in words is "one hundred sixty-five million, six hundred thirty-one thousand, four hundred forty-two".