161323025 has 12 divisors (see below), whose sum is σ = 200201100. Its totient is φ = 128954880.

The previous prime is 161323021. The next prime is 161323031. The reversal of 161323025 is 520323161.

It can be written as a sum of positive squares in 6 ways, for example, as 16265089 + 145057936 = 4033^2 + 12044^2 .

It is not a de Polignac number, because 161323025 - 2² = 161323021 is a prime.

It is not an unprimeable number, because it can be changed into a prime (161323021) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 50681 + ... + 53769.

It is an arithmetic number, because the mean of its divisors is an integer number (16683425).

Almost surely, 2^161323025 is an apocalyptic number.

It is an amenable number.

161323025 is a deficient number, since it is larger than the sum of its proper divisors (38878075).

161323025 is a wasteful number, since it uses less digits than its factorization.

161323025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5188 (or 5183 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 23.

The square root of 161323025 is about 12701.3001303016. The cubic root of 161323025 is about 544.3757687530.

Adding to 161323025 its reverse (520323161), we get a palindrome (681646186).

The spelling of 161323025 in words is "one hundred sixty-one million, three hundred twenty-three thousand, twenty-five".