165031994 has 4 divisors (see below), whose sum is σ = 247547994. Its totient is φ = 82515996.

The previous prime is 165031973. The next prime is 165032033. The reversal of 165031994 is 499130561.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 499130561 = 3253 ⋅153437.

It can be written as a sum of positive squares in only one way, i.e., 147501025 + 17530969 = 12145^2 + 4187^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41257997 + ... + 41258000.

Almost surely, 2^165031994 is an apocalyptic number.

165031994 is a deficient number, since it is larger than the sum of its proper divisors (82516000).

165031994 is an equidigital number, since it uses as much as digits as its factorization.

165031994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82515999.

The product of its (nonzero) digits is 29160, while the sum is 38.

The square root of 165031994 is about 12846.4778830620. The cubic root of 165031994 is about 548.5161036392.

The spelling of 165031994 in words is "one hundred sixty-five million, thirty-one thousand, nine hundred ninety-four".