161204825 has 12 divisors (see below), whose sum is σ = 204770748. Its totient is φ = 125817600.

The previous prime is 161204789. The next prime is 161204839. The reversal of 161204825 is 528402161.

It can be written as a sum of positive squares in 6 ways, for example, as 42133081 + 119071744 = 6491^2 + 10912^2 .

It is not a de Polignac number, because 161204825 - 2¹² = 161200729 is a prime.

It is a Duffinian 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, 77612 + ... + 79661.

It is an arithmetic number, because the mean of its divisors is an integer number (17064229).

Almost surely, 2^161204825 is an apocalyptic number.

It is an amenable number.

161204825 is a deficient number, since it is larger than the sum of its proper divisors (43565923).

161204825 is a wasteful number, since it uses less digits than its factorization.

161204825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157324 (or 157319 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 29.

The square root of 161204825 is about 12696.6462107125. The cubic root of 161204825 is about 544.2427831126.

Adding to 161204825 its reverse (528402161), we get a palindrome (689606986).

The spelling of 161204825 in words is "one hundred sixty-one million, two hundred four thousand, eight hundred twenty-five".