181631912449 has 16 divisors (see below), whose sum is σ = 196820688064. Its totient is φ = 166618296000.

The previous prime is 181631912443. The next prime is 181631912503. The reversal of 181631912449 is 944219136181.

It is not a de Polignac number, because 181631912449 - 2⁵ = 181631912417 is a prime.

It is not an unprimeable number, because it can be changed into a prime (181631912443) 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 in 15 ways as a sum of consecutive naturals, for example, 3463474 + ... + 3515524.

It is an arithmetic number, because the mean of its divisors is an integer number (12301293004).

Almost surely, 2^181631912449 is an apocalyptic number.

It is an amenable number.

181631912449 is a deficient number, since it is larger than the sum of its proper divisors (15188775615).

181631912449 is a wasteful number, since it uses less digits than its factorization.

181631912449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53728.

The product of its digits is 373248, while the sum is 49.

The spelling of 181631912449 in words is "one hundred eighty-one billion, six hundred thirty-one million, nine hundred twelve thousand, four hundred forty-nine".