181373057 has 4 divisors (see below), whose sum is σ = 183037140. Its totient is φ = 179708976.

The previous prime is 181372973. The next prime is 181373111. The reversal of 181373057 is 750373181.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 750373181 = 211 ⋅3556271.

It can be written as a sum of positive squares in 2 ways, for example, as 153536881 + 27836176 = 12391^2 + 5276^2 .

It is a cyclic number.

It is not a de Polignac number, because 181373057 - 2¹⁰ = 181372033 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (181372057) 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, 831878 + ... + 832095.

It is an arithmetic number, because the mean of its divisors is an integer number (45759285).

Almost surely, 2^181373057 is an apocalyptic number.

It is an amenable number.

181373057 is a deficient number, since it is larger than the sum of its proper divisors (1664083).

181373057 is a wasteful number, since it uses less digits than its factorization.

181373057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1664082.

The product of its (nonzero) digits is 17640, while the sum is 35.

The square root of 181373057 is about 13467.4814646243. The cubic root of 181373057 is about 566.0536446052.

The spelling of 181373057 in words is "one hundred eighty-one million, three hundred seventy-three thousand, fifty-seven".