40481508181 has 4 divisors (see below), whose sum is σ = 40484623500. Its totient is φ = 40478392864.

The previous prime is 40481508143. The next prime is 40481508209. The reversal of 40481508181 is 18180518404.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 22248407281 + 18233100900 = 149159^2 + 135030^2 .

It is a cyclic number.

It is not a de Polignac number, because 40481508181 - 2²¹ = 40479411029 is a prime.

It is a super-2 number, since 2×40481508181² (a number of 22 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40481508481) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 1538086 + ... + 1564183.

It is an arithmetic number, because the mean of its divisors is an integer number (10121155875).

Almost surely, 2^40481508181 is an apocalyptic number.

It is an amenable number.

40481508181 is a deficient number, since it is larger than the sum of its proper divisors (3115319).

40481508181 is a wasteful number, since it uses less digits than its factorization.

40481508181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3115318.

The product of its (nonzero) digits is 40960, while the sum is 40.

The spelling of 40481508181 in words is "forty billion, four hundred eighty-one million, five hundred eight thousand, one hundred eighty-one".