181243478029 has 2 divisors, whose sum is σ = 181243478030. Its totient is φ = 181243478028.

The previous prime is 181243478021. The next prime is 181243478033. The reversal of 181243478029 is 920874342181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 179882015625 + 1361462404 = 424125^2 + 36898^2 .

It is a cyclic number.

It is not a de Polignac number, because 181243478029 - 2³ = 181243478021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (181243478021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 90621739014 + 90621739015.

It is an arithmetic number, because the mean of its divisors is an integer number (90621739015).

Almost surely, 2^181243478029 is an apocalyptic number.

It is an amenable number.

181243478029 is a deficient number, since it is larger than the sum of its proper divisors (1).

181243478029 is an equidigital number, since it uses as much as digits as its factorization.

181243478029 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 774144, while the sum is 49.

The spelling of 181243478029 in words is "one hundred eighty-one billion, two hundred forty-three million, four hundred seventy-eight thousand, twenty-nine".