161224025 has 24 divisors (see below), whose sum is σ = 217248000. Its totient is φ = 118238400.

The previous prime is 161224003. The next prime is 161224027. The reversal of 161224025 is 520422161.

It is a happy number.

It is not a de Polignac number, because 161224025 - 2¹⁰ = 161223001 is a prime.

It is not an unprimeable number, because it can be changed into a prime (161224027) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 9251 + ... + 20199.

It is an arithmetic number, because the mean of its divisors is an integer number (9052000).

Almost surely, 2^161224025 is an apocalyptic number.

It is an amenable number.

161224025 is a deficient number, since it is larger than the sum of its proper divisors (56023975).

161224025 is a wasteful number, since it uses less digits than its factorization.

161224025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11009 (or 11004 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 161224025 is about 12697.4022933827. The cubic root of 161224025 is about 544.2643892621.

Adding to 161224025 its reverse (520422161), we get a palindrome (681646186).

The spelling of 161224025 in words is "one hundred sixty-one million, two hundred twenty-four thousand, twenty-five".