181373013 has 14 divisors (see below), whose sum is σ = 271936214. Its totient is φ = 120914856.

The previous prime is 181372973. The next prime is 181373111. The reversal of 181373013 is 310373181.

181373013 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 177902244 + 3470769 = 13338^2 + 1863^2 .

It is not a de Polignac number, because 181373013 - 2²⁶ = 114264149 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (181373113) by changing a digit.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 123670 + ... + 125127.

Almost surely, 2^181373013 is an apocalyptic number.

It is an amenable number.

181373013 is a deficient number, since it is larger than the sum of its proper divisors (90563201).

181373013 is an frugal number, since it uses more digits than its factorization.

181373013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 248815 (or 248800 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 27.

The square root of 181373013 is about 13467.4798310597. The cubic root of 181373013 is about 566.0535988315.

The spelling of 181373013 in words is "one hundred eighty-one million, three hundred seventy-three thousand, thirteen".