181097393 has 4 divisors (see below), whose sum is σ = 182790000. Its totient is φ = 179404788.

The previous prime is 181097353. The next prime is 181097407. The reversal of 181097393 is 393790181.

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: 393790181 = 19 ⋅20725799.

It is a cyclic number.

It is not a de Polignac number, because 181097393 - 2¹⁴ = 181081009 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 181097393.

It is not an unprimeable number, because it can be changed into a prime (181097353) 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, 846143 + ... + 846356.

It is an arithmetic number, because the mean of its divisors is an integer number (45697500).

Almost surely, 2^181097393 is an apocalyptic number.

It is an amenable number.

181097393 is a deficient number, since it is larger than the sum of its proper divisors (1692607).

181097393 is a wasteful number, since it uses less digits than its factorization.

181097393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1692606.

The product of its (nonzero) digits is 40824, while the sum is 41.

The square root of 181097393 is about 13457.2431426351. The cubic root of 181097393 is about 565.7667226569.

The spelling of 181097393 in words is "one hundred eighty-one million, ninety-seven thousand, three hundred ninety-three".