40121531008 has 64 divisors (see below), whose sum is σ = 86117096520. Its totient is φ = 18509230080.

The previous prime is 40121530979. The next prime is 40121531017. The reversal of 40121531008 is 80013512104.

It can be written as a sum of positive squares in 4 ways, for example, as 31029527104 + 9092003904 = 176152^2 + 95352^2 .

It is a tau number, because it is divible by the number of its divisors (64).

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 7 ways as a sum of consecutive naturals, for example, 5089566 + ... + 5097442.

Almost surely, 2^40121531008 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 40121531008, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43058548260).

40121531008 is an abundant number, since it is smaller than the sum of its proper divisors (45995565512).

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

40121531008 is a wasteful number, since it uses less digits than its factorization.

40121531008 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10965 (or 10953 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 25.

The spelling of 40121531008 in words is "forty billion, one hundred twenty-one million, five hundred thirty-one thousand, eight".