165631325 has 12 divisors (see below), whose sum is σ = 212465940. Its totient is φ = 127935360.

The previous prime is 165631273. The next prime is 165631339. The reversal of 165631325 is 523136561.

It can be written as a sum of positive squares in 6 ways, for example, as 12020089 + 153611236 = 3467^2 + 12394^2 .

It is not a de Polignac number, because 165631325 - 2⁶ = 165631261 is a prime.

It is a super-4 number, since 4×165631325⁴ (a number of 34 digits) contains 4444 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 165631291 and 165631300.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 113504 + ... + 114953.

It is an arithmetic number, because the mean of its divisors is an integer number (17705495).

Almost surely, 2^165631325 is an apocalyptic number.

It is an amenable number.

165631325 is a deficient number, since it is larger than the sum of its proper divisors (46834615).

165631325 is a wasteful number, since it uses less digits than its factorization.

165631325 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 228496 (or 228491 counting only the distinct ones).

The product of its digits is 16200, while the sum is 32.

The square root of 165631325 is about 12869.7834092109. The cubic root of 165631325 is about 549.1792993897.

Adding to 165631325 its reverse (523136561), we get a palindrome (688767886).

The spelling of 165631325 in words is "one hundred sixty-five million, six hundred thirty-one thousand, three hundred twenty-five".