165887231 has 4 divisors (see below), whose sum is σ = 171238464. Its totient is φ = 160536000.

The previous prime is 165887177. The next prime is 165887251. The reversal of 165887231 is 132788561.

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

It is a cyclic number.

It is not a de Polignac number, because 165887231 - 2¹⁴ = 165870847 is a prime.

It is a super-2 number, since 2×165887231² = 55037146817694722, which contains 22 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 (165887251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2675570 + ... + 2675631.

It is an arithmetic number, because the mean of its divisors is an integer number (42809616).

Almost surely, 2^165887231 is an apocalyptic number.

165887231 is a deficient number, since it is larger than the sum of its proper divisors (5351233).

165887231 is an equidigital number, since it uses as much as digits as its factorization.

165887231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5351232.

The product of its digits is 80640, while the sum is 41.

The square root of 165887231 is about 12879.7216973039. The cubic root of 165887231 is about 549.4619873837.

The spelling of 165887231 in words is "one hundred sixty-five million, eight hundred eighty-seven thousand, two hundred thirty-one".