41081391981 has 24 divisors (see below), whose sum is σ = 67934494784. Its totient is φ = 23434375680.

The previous prime is 41081391941. The next prime is 41081392019. The reversal of 41081391981 is 18919318014.

It is a happy number.

It is not a de Polignac number, because 41081391981 - 2³⁰ = 40007650157 is a prime.

It is a super-2 number, since 2×41081391981² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (41081391941) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 528715 + ... + 601416.

Almost surely, 2^41081391981 is an apocalyptic number.

It is an amenable number.

41081391981 is a deficient number, since it is larger than the sum of its proper divisors (26853102803).

41081391981 is a wasteful number, since it uses less digits than its factorization.

41081391981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1130721 (or 1130718 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 45.

The spelling of 41081391981 in words is "forty-one billion, eighty-one million, three hundred ninety-one thousand, nine hundred eighty-one".