165609231 has 8 divisors (see below), whose sum is σ = 221082624. Its totient is φ = 110271000.

The previous prime is 165609221. The next prime is 165609233. The reversal of 165609231 is 132906561.

It is a happy number.

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

It is not a de Polignac number, because 165609231 - 2⁹ = 165608719 is a prime.

It is a super-2 number, since 2×165609231² = 54852834784822722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 165609192 and 165609201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165609233) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30895 + ... + 35856.

It is an arithmetic number, because the mean of its divisors is an integer number (27635328).

Almost surely, 2^165609231 is an apocalyptic number.

165609231 is a deficient number, since it is larger than the sum of its proper divisors (55473393).

165609231 is an equidigital number, since it uses as much as digits as its factorization.

165609231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67581.

The product of its (nonzero) digits is 9720, while the sum is 33.

The square root of 165609231 is about 12868.9250133801. The cubic root of 165609231 is about 549.1548794780.

The spelling of 165609231 in words is "one hundred sixty-five million, six hundred nine thousand, two hundred thirty-one".