181331212625 has 8 divisors (see below), whose sum is σ = 226301353512. Its totient is φ = 145064970000.

The previous prime is 181331212619. The next prime is 181331212637. The reversal of 181331212625 is 526212133181.

It can be written as a sum of positive squares in 4 ways, for example, as 4029583441 + 177301629184 = 63479^2 + 421072^2 .

It is not a de Polignac number, because 181331212625 - 2⁶ = 181331212561 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 725324726 + ... + 725324975.

It is an arithmetic number, because the mean of its divisors is an integer number (28287669189).

Almost surely, 2^181331212625 is an apocalyptic number.

It is an amenable number.

181331212625 is a deficient number, since it is larger than the sum of its proper divisors (44970140887).

181331212625 is an equidigital number, since it uses as much as digits as its factorization.

181331212625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1450649716 (or 1450649706 counting only the distinct ones).

The product of its digits is 17280, while the sum is 35.

The spelling of 181331212625 in words is "one hundred eighty-one billion, three hundred thirty-one million, two hundred twelve thousand, six hundred twenty-five".