181391512225 has 96 divisors (see below), whose sum is σ = 287653588992. Its totient is φ = 110168640000.

The previous prime is 181391512213. The next prime is 181391512283. The reversal of 181391512225 is 522215193181.

181391512225 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 181391512225 - 2⁹ = 181391511713 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 97155742 + ... + 97157608.

It is an arithmetic number, because the mean of its divisors is an integer number (2996391552).

Almost surely, 2^181391512225 is an apocalyptic number.

It is an amenable number.

181391512225 is a deficient number, since it is larger than the sum of its proper divisors (106262076767).

181391512225 is a wasteful number, since it uses less digits than its factorization.

181391512225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3167 (or 3162 counting only the distinct ones).

The product of its digits is 43200, while the sum is 40.

The spelling of 181391512225 in words is "one hundred eighty-one billion, three hundred ninety-one million, five hundred twelve thousand, two hundred twenty-five".