161193393 has 6 divisors (see below), whose sum is σ = 232834914. Its totient is φ = 107462256.

The previous prime is 161193391. The next prime is 161193401. The reversal of 161193393 is 393391161.

161193393 is a `hidden beast` number, since 1 + 611 + 9 + 3 + 39 + 3 = 666.

It can be written as a sum of positive squares in only one way, i.e., 81216144 + 79977249 = 9012^2 + 8943^2 .

It is not a de Polignac number, because 161193393 - 2¹ = 161193391 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (161193391) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8955180 + ... + 8955197.

It is an arithmetic number, because the mean of its divisors is an integer number (38805819).

Almost surely, 2^161193393 is an apocalyptic number.

It is an amenable number.

161193393 is a deficient number, since it is larger than the sum of its proper divisors (71641521).

161193393 is a wasteful number, since it uses less digits than its factorization.

161193393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17910383 (or 17910380 counting only the distinct ones).

The product of its digits is 13122, while the sum is 36.

The square root of 161193393 is about 12696.1960051033. The cubic root of 161193393 is about 544.2299176363.

The spelling of 161193393 in words is "one hundred sixty-one million, one hundred ninety-three thousand, three hundred ninety-three".