181468613 has 2 divisors, whose sum is σ = 181468614. Its totient is φ = 181468612.

The previous prime is 181468561. The next prime is 181468633. The reversal of 181468613 is 316864181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 106853569 + 74615044 = 10337^2 + 8638^2 .

It is a cyclic number.

It is not a de Polignac number, because 181468613 - 2¹⁰ = 181467589 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (181468633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 90734306 + 90734307.

It is an arithmetic number, because the mean of its divisors is an integer number (90734307).

Almost surely, 2^181468613 is an apocalyptic number.

It is an amenable number.

181468613 is a deficient number, since it is larger than the sum of its proper divisors (1).

181468613 is an equidigital number, since it uses as much as digits as its factorization.

181468613 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27648, while the sum is 38.

The square root of 181468613 is about 13471.0286541155. The cubic root of 181468613 is about 566.1530351959.

The spelling of 181468613 in words is "one hundred eighty-one million, four hundred sixty-eight thousand, six hundred thirteen".