161273225 has 6 divisors (see below), whose sum is σ = 199978830. Its totient is φ = 129018560.

The previous prime is 161273219. The next prime is 161273227. The reversal of 161273225 is 522372161.

It is a happy number.

161273225 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 3 ways, for example, as 414736 + 160858489 = 644^2 + 12683^2 .

It is not a de Polignac number, because 161273225 - 2⁴ = 161273209 is a prime.

It is not an unprimeable number, because it can be changed into a prime (161273227) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3225440 + ... + 3225489.

It is an arithmetic number, because the mean of its divisors is an integer number (33329805).

Almost surely, 2^161273225 is an apocalyptic number.

It is an amenable number.

161273225 is a deficient number, since it is larger than the sum of its proper divisors (38705605).

161273225 is an equidigital number, since it uses as much as digits as its factorization.

161273225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6450939 (or 6450934 counting only the distinct ones).

The product of its digits is 5040, while the sum is 29.

The square root of 161273225 is about 12699.3395497561. The cubic root of 161273225 is about 544.3197471914.

The spelling of 161273225 in words is "one hundred sixty-one million, two hundred seventy-three thousand, two hundred twenty-five".