161273193 has 4 divisors (see below), whose sum is σ = 215030928. Its totient is φ = 107515460.

The previous prime is 161273179. The next prime is 161273201. The reversal of 161273193 is 391372161.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 391372161 = 3 ⋅130457387.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161273193 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (161273113) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26878863 + ... + 26878868.

It is an arithmetic number, because the mean of its divisors is an integer number (53757732).

Almost surely, 2^161273193 is an apocalyptic number.

It is an amenable number.

161273193 is a deficient number, since it is larger than the sum of its proper divisors (53757735).

161273193 is an equidigital number, since it uses as much as digits as its factorization.

161273193 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53757734.

The product of its digits is 6804, while the sum is 33.

The square root of 161273193 is about 12699.3382898480. The cubic root of 161273193 is about 544.3197111899.

The spelling of 161273193 in words is "one hundred sixty-one million, two hundred seventy-three thousand, one hundred ninety-three".