181431327540 has 48 divisors (see below), whose sum is σ = 508645251072. Its totient is φ = 48320969856.

The previous prime is 181431327521. The next prime is 181431327577. The reversal of 181431327540 is 45723134181.

181431327540 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×181431327540² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 1849204 + ... + 1944843.

It is an arithmetic number, because the mean of its divisors is an integer number (10596776064).

Almost surely, 2^181431327540 is an apocalyptic number.

181431327540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

181431327540 is an abundant number, since it is smaller than the sum of its proper divisors (327213923532).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

181431327540 is a wasteful number, since it uses less digits than its factorization.

181431327540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3794856 (or 3794854 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 39.

The spelling of 181431327540 in words is "one hundred eighty-one billion, four hundred thirty-one million, three hundred twenty-seven thousand, five hundred forty".