161892225 has 72 divisors (see below), whose sum is σ = 319176000. Its totient is φ = 77788800.

The previous prime is 161892223. The next prime is 161892229. The reversal of 161892225 is 522298161.

It is not a de Polignac number, because 161892225 - 2¹ = 161892223 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 161892225.

It is not an unprimeable number, because it can be changed into a prime (161892221) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 368556 + ... + 368994.

It is an arithmetic number, because the mean of its divisors is an integer number (4433000).

Almost surely, 2^161892225 is an apocalyptic number.

161892225 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

161892225 is a deficient number, since it is larger than the sum of its proper divisors (157283775).

161892225 is a wasteful number, since it uses less digits than its factorization.

161892225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 615 (or 607 counting only the distinct ones).

The product of its digits is 17280, while the sum is 36.

The square root of 161892225 is about 12723.6875551076. The cubic root of 161892225 is about 545.0152620365.

The spelling of 161892225 in words is "one hundred sixty-one million, eight hundred ninety-two thousand, two hundred twenty-five".