161291394 has 24 divisors (see below), whose sum is σ = 381234672. Its totient is φ = 48876120.

The previous prime is 161291371. The next prime is 161291441. The reversal of 161291394 is 493192161.

It is a happy number.

161291394 is a `hidden beast` number, since 1 + 612 + 9 + 1 + 39 + 4 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 407104 + ... + 407499.

It is an arithmetic number, because the mean of its divisors is an integer number (15884778).

Almost surely, 2^161291394 is an apocalyptic number.

161291394 is an abundant number, since it is smaller than the sum of its proper divisors (219943278).

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

161291394 is a wasteful number, since it uses less digits than its factorization.

161291394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 814622 (or 814619 counting only the distinct ones).

The product of its digits is 11664, while the sum is 36.

The square root of 161291394 is about 12700.0548817712. The cubic root of 161291394 is about 544.3401873980.

The spelling of 161291394 in words is "one hundred sixty-one million, two hundred ninety-one thousand, three hundred ninety-four".