41771981 has 4 divisors (see below), whose sum is σ = 41807964. Its totient is φ = 41736000.

The previous prime is 41771971. The next prime is 41771993. The reversal of 41771981 is 18917714.

It is a happy number.

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 4452100 + 37319881 = 2110^2 + 6109^2 .

It is a cyclic number.

It is not a de Polignac number, because 41771981 - 2¹⁰ = 41770957 is a prime.

It is a super-2 number, since 2×41771981² = 3489796793328722, which 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 (41771921) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16190 + ... + 18591.

It is an arithmetic number, because the mean of its divisors is an integer number (10451991).

Almost surely, 2^41771981 is an apocalyptic number.

It is an amenable number.

41771981 is a deficient number, since it is larger than the sum of its proper divisors (35983).

41771981 is a wasteful number, since it uses less digits than its factorization.

41771981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35982.

The product of its digits is 14112, while the sum is 38.

The square root of 41771981 is about 6463.1247086839. The cubic root of 41771981 is about 346.9724749571.

The spelling of 41771981 in words is "forty-one million, seven hundred seventy-one thousand, nine hundred eighty-one".