161081394 has 16 divisors (see below), whose sum is σ = 332555520. Its totient is φ = 51961680.

The previous prime is 161081383. The next prime is 161081407. The reversal of 161081394 is 493180161.

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 7 ways as a sum of consecutive naturals, for example, 432829 + ... + 433200.

It is an arithmetic number, because the mean of its divisors is an integer number (20784720).

Almost surely, 2^161081394 is an apocalyptic number.

161081394 is an abundant number, since it is smaller than the sum of its proper divisors (171474126).

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

161081394 is a wasteful number, since it uses less digits than its factorization.

161081394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 866065.

The product of its (nonzero) digits is 5184, while the sum is 33.

The square root of 161081394 is about 12691.7845080981. The cubic root of 161081394 is about 544.1038427233.

The spelling of 161081394 in words is "one hundred sixty-one million, eighty-one thousand, three hundred ninety-four".