172181439049 has 2 divisors, whose sum is σ = 172181439050. Its totient is φ = 172181439048.

The previous prime is 172181439047. The next prime is 172181439097. The reversal of 172181439049 is 940934181271.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 170300655625 + 1880783424 = 412675^2 + 43368^2 .

It is a cyclic number.

It is not a de Polignac number, because 172181439049 - 2¹ = 172181439047 is a prime.

Together with 172181439047, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 172181438993 and 172181439011.

It is not a weakly prime, because it can be changed into another prime (172181439043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86090719524 + 86090719525.

It is an arithmetic number, because the mean of its divisors is an integer number (86090719525).

Almost surely, 2^172181439049 is an apocalyptic number.

It is an amenable number.

172181439049 is a deficient number, since it is larger than the sum of its proper divisors (1).

172181439049 is an equidigital number, since it uses as much as digits as its factorization.

172181439049 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 435456, while the sum is 49.

The spelling of 172181439049 in words is "one hundred seventy-two billion, one hundred eighty-one million, four hundred thirty-nine thousand, forty-nine".