181464013 has 2 divisors, whose sum is σ = 181464014. Its totient is φ = 181464012.

The previous prime is 181463993. The next prime is 181464071. The reversal of 181464013 is 310464181.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 159213924 + 22250089 = 12618^2 + 4717^2 .

It is an emirp because it is prime and its reverse (310464181) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 181464013 - 2⁹ = 181463501 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (181464313) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 90732006 + 90732007.

It is an arithmetic number, because the mean of its divisors is an integer number (90732007).

Almost surely, 2^181464013 is an apocalyptic number.

It is an amenable number.

181464013 is a deficient number, since it is larger than the sum of its proper divisors (1).

181464013 is an equidigital number, since it uses as much as digits as its factorization.

181464013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 181464013 is about 13470.8579162576. The cubic root of 181464013 is about 566.1482514008.

The spelling of 181464013 in words is "one hundred eighty-one million, four hundred sixty-four thousand, thirteen".