161181425 has 6 divisors (see below), whose sum is σ = 199864998. Its totient is φ = 128945120.

The previous prime is 161181413. The next prime is 161181439. The reversal of 161181425 is 524181161.

It can be written as a sum of positive squares in 3 ways, for example, as 33965584 + 127215841 = 5828^2 + 11279^2 .

It is not a de Polignac number, because 161181425 - 2⁸ = 161181169 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3223604 + ... + 3223653.

It is an arithmetic number, because the mean of its divisors is an integer number (33310833).

Almost surely, 2^161181425 is an apocalyptic number.

It is an amenable number.

161181425 is a deficient number, since it is larger than the sum of its proper divisors (38683573).

161181425 is an equidigital number, since it uses as much as digits as its factorization.

161181425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6447267 (or 6447262 counting only the distinct ones).

The product of its digits is 1920, while the sum is 29.

The square root of 161181425 is about 12695.7246740783. The cubic root of 161181425 is about 544.2164482984.

The spelling of 161181425 in words is "one hundred sixty-one million, one hundred eighty-one thousand, four hundred twenty-five".