161894052 has 30 divisors (see below), whose sum is σ = 423223878. Its totient is φ = 53964576.

The previous prime is 161894027. The next prime is 161894081. The reversal of 161894052 is 250498161.

It can be written as a sum of positive squares in only one way, i.e., 121749156 + 40144896 = 11034^2 + 6336^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 161893998 and 161894016.

It is an unprimeable number.

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 9 ways as a sum of consecutive naturals, for example, 249513 + ... + 250160.

Almost surely, 2^161894052 is an apocalyptic number.

161894052 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

161894052 is an abundant number, since it is smaller than the sum of its proper divisors (261329826).

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

161894052 is a wasteful number, since it uses less digits than its factorization.

161894052 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 499689 (or 499678 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 36.

The square root of 161894052 is about 12723.7593501292. The cubic root of 161894052 is about 545.0173122464.

The spelling of 161894052 in words is "one hundred sixty-one million, eight hundred ninety-four thousand, fifty-two".