161830825 has 24 divisors (see below), whose sum is σ = 216783000. Its totient is φ = 119132160.

The previous prime is 161830811. The next prime is 161830831. The reversal of 161830825 is 528038161.

It can be written as a sum of positive squares in 12 ways, for example, as 115004176 + 46826649 = 10724^2 + 6843^2 .

It is a de Polignac number, because none of the positive numbers 2^k-161830825 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 145371 + ... + 146479.

It is an arithmetic number, because the mean of its divisors is an integer number (9032625).

Almost surely, 2^161830825 is an apocalyptic number.

It is an amenable number.

161830825 is a deficient number, since it is larger than the sum of its proper divisors (54952175).

161830825 is a wasteful number, since it uses less digits than its factorization.

161830825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1581 (or 1576 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 34.

The square root of 161830825 is about 12721.2745037594. The cubic root of 161830825 is about 544.9463516476.

Adding to 161830825 its reverse (528038161), we get a palindrome (689868986).

The spelling of 161830825 in words is "one hundred sixty-one million, eight hundred thirty thousand, eight hundred twenty-five".