161505532 has 6 divisors (see below), whose sum is σ = 282634688. Its totient is φ = 80752764.

The previous prime is 161505521. The next prime is 161505569. The reversal of 161505532 is 235505161.

It is a self number, because there is not a number n which added to its sum of digits gives 161505532.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20188188 + ... + 20188195.

Almost surely, 2^161505532 is an apocalyptic number.

It is an amenable number.

161505532 is a deficient number, since it is larger than the sum of its proper divisors (121129156).

161505532 is a wasteful number, since it uses less digits than its factorization.

161505532 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40376387 (or 40376385 counting only the distinct ones).

The product of its (nonzero) digits is 4500, while the sum is 28.

The square root of 161505532 is about 12708.4826789039. The cubic root of 161505532 is about 544.5809780335.

The spelling of 161505532 in words is "one hundred sixty-one million, five hundred five thousand, five hundred thirty-two".