161325121 has 16 divisors (see below), whose sum is σ = 175824000. Its totient is φ = 147426048.

The previous prime is 161325083. The next prime is 161325127. The reversal of 161325121 is 121523161.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 161325121 - 2¹¹ = 161323073 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 161325092 and 161325101.

It is not an unprimeable number, because it can be changed into a prime (161325127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 144915 + ... + 146023.

It is an arithmetic number, because the mean of its divisors is an integer number (10989000).

Almost surely, 2^161325121 is an apocalyptic number.

It is an amenable number.

161325121 is a deficient number, since it is larger than the sum of its proper divisors (14498879).

161325121 is a wasteful number, since it uses less digits than its factorization.

161325121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1368.

The product of its digits is 360, while the sum is 22.

The square root of 161325121 is about 12701.3826412718. The cubic root of 161325121 is about 544.3781263554.

Adding to 161325121 its reverse (121523161), we get a palindrome (282848282).

The spelling of 161325121 in words is "one hundred sixty-one million, three hundred twenty-five thousand, one hundred twenty-one".