41509981 has 4 divisors (see below), whose sum is σ = 42213600. Its totient is φ = 40806364.

The previous prime is 41509973. The next prime is 41510033. The reversal of 41509981 is 18990514.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 41509981 - 2³ = 41509973 is a prime.

It is a super-2 number, since 2×41509981² = 3446157045240722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 41509981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (41509781) 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, 351721 + ... + 351838.

It is an arithmetic number, because the mean of its divisors is an integer number (10553400).

Almost surely, 2^41509981 is an apocalyptic number.

It is an amenable number.

41509981 is a deficient number, since it is larger than the sum of its proper divisors (703619).

41509981 is an equidigital number, since it uses as much as digits as its factorization.

41509981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 703618.

The product of its (nonzero) digits is 12960, while the sum is 37.

The square root of 41509981 is about 6442.8239926293. The cubic root of 41509981 is about 346.2455322270.

The spelling of 41509981 in words is "forty-one million, five hundred nine thousand, nine hundred eighty-one".