161505522 has 32 divisors (see below), whose sum is σ = 365679360. Its totient is φ = 52818480.

The previous prime is 161505521. The next prime is 161505569. The reversal of 161505522 is 225505161.

161505522 is a `hidden beast` number, since 1 + 61 + 50 + 552 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (161505521) 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, 25354 + ... + 31077.

It is an arithmetic number, because the mean of its divisors is an integer number (11427480).

Almost surely, 2^161505522 is an apocalyptic number.

161505522 is an abundant number, since it is smaller than the sum of its proper divisors (204173838).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161505522 is a wasteful number, since it uses less digits than its factorization.

161505522 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56495 (or 56489 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 27.

The square root of 161505522 is about 12708.4822854659. The cubic root of 161505522 is about 544.5809667939.

The spelling of 161505522 in words is "one hundred sixty-one million, five hundred five thousand, five hundred twenty-two".