161500525 has 12 divisors (see below), whose sum is σ = 200513952. Its totient is φ = 129037040.

The previous prime is 161500519. The next prime is 161500529. The reversal of 161500525 is 525005161.

It is not a de Polignac number, because 161500525 - 2⁷ = 161500397 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 161500525.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161500529) 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 11 ways as a sum of consecutive naturals, for example, 18534 + ... + 25816.

It is an arithmetic number, because the mean of its divisors is an integer number (16709496).

Almost surely, 2^161500525 is an apocalyptic number.

It is an amenable number.

161500525 is a deficient number, since it is larger than the sum of its proper divisors (39013427).

161500525 is an equidigital number, since it uses as much as digits as its factorization.

161500525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8180 (or 8175 counting only the distinct ones).

The product of its (nonzero) digits is 1500, while the sum is 25.

The square root of 161500525 is about 12708.2856829708. The cubic root of 161500525 is about 544.5753502694.

Adding to 161500525 its reverse (525005161), we get a palindrome (686505686).

The spelling of 161500525 in words is "one hundred sixty-one million, five hundred thousand, five hundred twenty-five".