41781959981 has 8 divisors (see below), whose sum is σ = 42461346624. Its totient is φ = 41104213920.

The previous prime is 41781959953. The next prime is 41781960007. The reversal of 41781959981 is 18995918714.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-41781959981 is a prime.

It is a super-2 number, since 2×41781959981² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (41781959911) 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 7 ways as a sum of consecutive naturals, for example, 358745 + ... + 460718.

It is an arithmetic number, because the mean of its divisors is an integer number (5307668328).

Almost surely, 2^41781959981 is an apocalyptic number.

It is an amenable number.

41781959981 is a deficient number, since it is larger than the sum of its proper divisors (679386643).

41781959981 is an equidigital number, since it uses as much as digits as its factorization.

41781959981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 820291.

The product of its digits is 6531840, while the sum is 62.

The spelling of 41781959981 in words is "forty-one billion, seven hundred eighty-one million, nine hundred fifty-nine thousand, nine hundred eighty-one".