181373053 has 4 divisors (see below), whose sum is σ = 185796828. Its totient is φ = 176949280.

The previous prime is 181372973. The next prime is 181373111. The reversal of 181373053 is 350373181.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 104407524 + 76965529 = 10218^2 + 8773^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-181373053 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (181373953) 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, 2211826 + ... + 2211907.

It is an arithmetic number, because the mean of its divisors is an integer number (46449207).

Almost surely, 2^181373053 is an apocalyptic number.

It is an amenable number.

181373053 is a deficient number, since it is larger than the sum of its proper divisors (4423775).

181373053 is an equidigital number, since it uses as much as digits as its factorization.

181373053 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4423774.

The product of its (nonzero) digits is 7560, while the sum is 31.

The square root of 181373053 is about 13467.4813161185. The cubic root of 181373053 is about 566.0536404440.

The spelling of 181373053 in words is "one hundred eighty-one million, three hundred seventy-three thousand, fifty-three".