161857134 has 24 divisors (see below), whose sum is σ = 352515072. Its totient is φ = 53671680.

The previous prime is 161857127. The next prime is 161857147. The reversal of 161857134 is 431758161.

161857134 is a `hidden beast` number, since 1 + 618 + 5 + 7 + 1 + 34 = 666.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 19822 + ... + 26769.

It is an arithmetic number, because the mean of its divisors is an integer number (14688128).

Almost surely, 2^161857134 is an apocalyptic number.

161857134 is an abundant number, since it is smaller than the sum of its proper divisors (190657938).

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

161857134 is a wasteful number, since it uses less digits than its factorization.

161857134 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46792 (or 46789 counting only the distinct ones).

The product of its digits is 20160, while the sum is 36.

The square root of 161857134 is about 12722.3085169320. The cubic root of 161857134 is about 544.9758808730.

The spelling of 161857134 in words is "one hundred sixty-one million, eight hundred fifty-seven thousand, one hundred thirty-four".