161671225 has 9 divisors (see below), whose sum is σ = 200551183. Its totient is φ = 129286120.

The previous prime is 161671219. The next prime is 161671243. The reversal of 161671225 is 522176161.

The square root of 161671225 is 12715.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 58201641 + 103469584 = 7629^2 + 10172^2 .

It is not a de Polignac number, because 161671225 - 2²¹ = 159574073 is a prime.

It is a super-2 number, since 2×161671225² = 52275169986001250, which contains 22 as substring.

It is a Duffinian number.

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 8 ways as a sum of consecutive naturals, for example, 62304 + ... + 64846.

Almost surely, 2^161671225 is an apocalyptic number.

161671225 is the 12715-th square number.

161671225 is the 6358-th centered octagonal number.

It is an amenable number.

161671225 is a deficient number, since it is larger than the sum of its proper divisors (38879958).

161671225 is an frugal number, since it uses more digits than its factorization.

161671225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5096 (or 2548 counting only the distinct ones).

The product of its digits is 5040, while the sum is 31.

The cubic root of 161671225 is about 544.7671479537.

The spelling of 161671225 in words is "one hundred sixty-one million, six hundred seventy-one thousand, two hundred twenty-five".