41991391 has 16 divisors (see below), whose sum is σ = 48303360. Its totient is φ = 36207360.

The previous prime is 41991319. The next prime is 41991403. The reversal of 41991391 is 19319914.

It is a cyclic number.

It is not a de Polignac number, because 41991391 - 2¹³ = 41983199 is a prime.

It is a super-2 number, since 2×41991391² = 3526553836229762, 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 41991391.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (41991791) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9891 + ... + 13483.

It is an arithmetic number, because the mean of its divisors is an integer number (3018960).

Almost surely, 2^41991391 is an apocalyptic number.

41991391 is a deficient number, since it is larger than the sum of its proper divisors (6311969).

41991391 is a wasteful number, since it uses less digits than its factorization.

41991391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3666.

The product of its digits is 8748, while the sum is 37.

The square root of 41991391 is about 6480.0764655982. The cubic root of 41991391 is about 347.5789127757.

The spelling of 41991391 in words is "forty-one million, nine hundred ninety-one thousand, three hundred ninety-one".