181457213 has 16 divisors (see below), whose sum is σ = 217019520. Its totient is φ = 148464576.

The previous prime is 181457203. The next prime is 181457251. The reversal of 181457213 is 312754181.

181457213 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 181457213 - 2⁴ = 181457197 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 181457213.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (181457203) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7118 + ... + 20336.

It is an arithmetic number, because the mean of its divisors is an integer number (13563720).

Almost surely, 2^181457213 is an apocalyptic number.

It is an amenable number.

181457213 is a deficient number, since it is larger than the sum of its proper divisors (35562307).

181457213 is a wasteful number, since it uses less digits than its factorization.

181457213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13316.

The product of its digits is 6720, while the sum is 32.

The square root of 181457213 is about 13470.6055171993. The cubic root of 181457213 is about 566.1411795557.

The spelling of 181457213 in words is "one hundred eighty-one million, four hundred fifty-seven thousand, two hundred thirteen".