41991121 has 4 divisors (see below), whose sum is σ = 44201200. Its totient is φ = 39781044.

The previous prime is 41991109. The next prime is 41991127. The reversal of 41991121 is 12119914.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12119914 = 2 ⋅6059957.

It is a cyclic number.

It is not a de Polignac number, because 41991121 - 2¹³ = 41982929 is a prime.

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 41991121.

It is not an unprimeable number, because it can be changed into a prime (41991127) 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, 1105011 + ... + 1105048.

It is an arithmetic number, because the mean of its divisors is an integer number (11050300).

Almost surely, 2^41991121 is an apocalyptic number.

It is an amenable number.

41991121 is a deficient number, since it is larger than the sum of its proper divisors (2210079).

41991121 is a wasteful number, since it uses less digits than its factorization.

41991121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2210078.

The product of its digits is 648, while the sum is 28.

The square root of 41991121 is about 6480.0556324772. The cubic root of 41991121 is about 347.5781678095.

The spelling of 41991121 in words is "forty-one million, nine hundred ninety-one thousand, one hundred twenty-one".