161215532 has 24 divisors (see below), whose sum is σ = 297528000. Its totient is φ = 76223376.

The previous prime is 161215529. The next prime is 161215577. The reversal of 161215532 is 235512161.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 47219 + ... + 50517.

It is an arithmetic number, because the mean of its divisors is an integer number (12397000).

Almost surely, 2^161215532 is an apocalyptic number.

It is an amenable number.

161215532 is a deficient number, since it is larger than the sum of its proper divisors (136312468).

161215532 is a wasteful number, since it uses less digits than its factorization.

161215532 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3965 (or 3963 counting only the distinct ones).

The product of its digits is 1800, while the sum is 26.

The square root of 161215532 is about 12697.0678504921. The cubic root of 161215532 is about 544.2548321285.

Adding to 161215532 its reverse (235512161), we get a palindrome (396727693).

The spelling of 161215532 in words is "one hundred sixty-one million, two hundred fifteen thousand, five hundred thirty-two".