41051981 has 4 divisors (see below), whose sum is σ = 42161532. Its totient is φ = 39942432.

The previous prime is 41051977. The next prime is 41051993. The reversal of 41051981 is 18915014.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18915014 = 2 ⋅9457507.

It can be written as a sum of positive squares in 2 ways, for example, as 39175081 + 1876900 = 6259^2 + 1370^2 .

It is a cyclic number.

It is not a de Polignac number, because 41051981 - 2² = 41051977 is a prime.

It is a super-2 number, since 2×41051981² = 3370530288048722, which 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 (41051911) 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, 554720 + ... + 554793.

It is an arithmetic number, because the mean of its divisors is an integer number (10540383).

Almost surely, 2^41051981 is an apocalyptic number.

It is an amenable number.

41051981 is a deficient number, since it is larger than the sum of its proper divisors (1109551).

41051981 is a wasteful number, since it uses less digits than its factorization.

41051981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1109550.

The product of its (nonzero) digits is 1440, while the sum is 29.

The square root of 41051981 is about 6407.1819858655. The cubic root of 41051981 is about 344.9673875215.

Adding to 41051981 its reverse (18915014), we get a palindrome (59966995).

The spelling of 41051981 in words is "forty-one million, fifty-one thousand, nine hundred eighty-one".