161623325 has 6 divisors (see below), whose sum is σ = 200412954. Its totient is φ = 129298640.

The previous prime is 161623321. The next prime is 161623333. The reversal of 161623325 is 523326161.

It can be written as a sum of positive squares in 3 ways, for example, as 37724164 + 123899161 = 6142^2 + 11131^2 .

It is not a de Polignac number, because 161623325 - 2² = 161623321 is a prime.

It is a super-2 number, since 2×161623325² = 52244198368111250, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161623321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3232442 + ... + 3232491.

It is an arithmetic number, because the mean of its divisors is an integer number (33402159).

Almost surely, 2^161623325 is an apocalyptic number.

It is an amenable number.

161623325 is a deficient number, since it is larger than the sum of its proper divisors (38789629).

161623325 is an equidigital number, since it uses as much as digits as its factorization.

161623325 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6464943 (or 6464938 counting only the distinct ones).

The product of its digits is 6480, while the sum is 29.

The square root of 161623325 is about 12713.1162584160. The cubic root of 161623325 is about 544.7133413803.

Adding to 161623325 its reverse (523326161), we get a palindrome (684949486).

The spelling of 161623325 in words is "one hundred sixty-one million, six hundred twenty-three thousand, three hundred twenty-five".