161225545 has 16 divisors (see below), whose sum is σ = 219320640. Its totient is φ = 112791744.

The previous prime is 161225531. The next prime is 161225551. The reversal of 161225545 is 545522161.

It is a de Polignac number, because none of the positive numbers 2^k-161225545 is a prime.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 64039 + ... + 66508.

It is an arithmetic number, because the mean of its divisors is an integer number (13707540).

Almost surely, 2^161225545 is an apocalyptic number.

It is an amenable number.

161225545 is a deficient number, since it is larger than the sum of its proper divisors (58095095).

161225545 is a wasteful number, since it uses less digits than its factorization.

161225545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130584.

The product of its digits is 12000, while the sum is 31.

The square root of 161225545 is about 12697.4621480042. The cubic root of 161225545 is about 544.2660996756.

The spelling of 161225545 in words is "one hundred sixty-one million, two hundred twenty-five thousand, five hundred forty-five".