165636231 has 4 divisors (see below), whose sum is σ = 220848312. Its totient is φ = 110424152.

The previous prime is 165636217. The next prime is 165636239. The reversal of 165636231 is 132636561.

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 165636231 - 2¹⁰ = 165635207 is a prime.

It is a super-2 number, since 2×165636231² = 54870722039770722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 165636192 and 165636201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165636239) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27606036 + ... + 27606041.

It is an arithmetic number, because the mean of its divisors is an integer number (55212078).

Almost surely, 2^165636231 is an apocalyptic number.

165636231 is a deficient number, since it is larger than the sum of its proper divisors (55212081).

165636231 is an equidigital number, since it uses as much as digits as its factorization.

165636231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55212080.

The product of its digits is 19440, while the sum is 33.

The square root of 165636231 is about 12869.9740092978. The cubic root of 165636231 is about 549.1847215666.

The spelling of 165636231 in words is "one hundred sixty-five million, six hundred thirty-six thousand, two hundred thirty-one".