41998991 has 4 divisors (see below), whose sum is σ = 42082992. Its totient is φ = 41914992.

The previous prime is 41998969. The next prime is 41999029. The reversal of 41998991 is 19989914.

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

It is a cyclic number.

It is not a de Polignac number, because 41998991 - 2¹⁴ = 41982607 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (41998921) 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, 41246 + ... + 42251.

It is an arithmetic number, because the mean of its divisors is an integer number (10520748).

Almost surely, 2^41998991 is an apocalyptic number.

41998991 is a deficient number, since it is larger than the sum of its proper divisors (84001).

41998991 is an equidigital number, since it uses as much as digits as its factorization.

41998991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84000.

The product of its digits is 209952, while the sum is 50.

The square root of 41998991 is about 6480.6628519003. The cubic root of 41998991 is about 347.5998808863.

The spelling of 41998991 in words is "forty-one million, nine hundred ninety-eight thousand, nine hundred ninety-one".