165031993 has 8 divisors (see below), whose sum is σ = 192621312. Its totient is φ = 138446016.

The previous prime is 165031973. The next prime is 165032033. The reversal of 165031993 is 399130561.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 165031993 - 2⁹ = 165031481 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165031913) by changing a digit.

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 in 7 ways as a sum of consecutive naturals, for example, 250480 + ... + 251137.

It is an arithmetic number, because the mean of its divisors is an integer number (24077664).

Almost surely, 2^165031993 is an apocalyptic number.

It is an amenable number.

165031993 is a deficient number, since it is larger than the sum of its proper divisors (27589319).

165031993 is an equidigital number, since it uses as much as digits as its factorization.

165031993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 501671.

The product of its (nonzero) digits is 21870, while the sum is 37.

The square root of 165031993 is about 12846.4778441408. The cubic root of 165031993 is about 548.5161025313.

It can be divided in two parts, 16503 and 1993, that added together give a square (18496 = 136²).

The spelling of 165031993 in words is "one hundred sixty-five million, thirty-one thousand, nine hundred ninety-three".