161224625 has 16 divisors (see below), whose sum is σ = 203071440. Its totient is φ = 127785600.

The previous prime is 161224619. The next prime is 161224627. The reversal of 161224625 is 526422161.

161224625 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 8 ways, for example, as 8479744 + 152744881 = 2912^2 + 12359^2 .

It is not a de Polignac number, because 161224625 - 2¹⁴ = 161208241 is a prime.

It is not an unprimeable number, because it can be changed into a prime (161224627) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7709 + ... + 19541.

It is an arithmetic number, because the mean of its divisors is an integer number (12691965).

Almost surely, 2^161224625 is an apocalyptic number.

It is an amenable number.

161224625 is a deficient number, since it is larger than the sum of its proper divisors (41846815).

161224625 is a wasteful number, since it uses less digits than its factorization.

161224625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11957 (or 11947 counting only the distinct ones).

The product of its digits is 5760, while the sum is 29.

The square root of 161224625 is about 12697.4259202407. The cubic root of 161224625 is about 544.2650644266.

Adding to 161224625 its reverse (526422161), we get a palindrome (687646786).

The spelling of 161224625 in words is "one hundred sixty-one million, two hundred twenty-four thousand, six hundred twenty-five".