41851991 has 4 divisors (see below), whose sum is σ = 42018984. Its totient is φ = 41685000.

The previous prime is 41851981. The next prime is 41852009. The reversal of 41851991 is 19915814.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-41851991 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (41851981) 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, 83120 + ... + 83621.

It is an arithmetic number, because the mean of its divisors is an integer number (10504746).

Almost surely, 2^41851991 is an apocalyptic number.

41851991 is a deficient number, since it is larger than the sum of its proper divisors (166993).

41851991 is a wasteful number, since it uses less digits than its factorization.

41851991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166992.

The product of its digits is 12960, while the sum is 38.

The square root of 41851991 is about 6469.3114780477. The cubic root of 41851991 is about 347.1938638823.

The spelling of 41851991 in words is "forty-one million, eight hundred fifty-one thousand, nine hundred ninety-one".