41601991 has 2 divisors, whose sum is σ = 41601992. Its totient is φ = 41601990.

The previous prime is 41601983. The next prime is 41602049. The reversal of 41601991 is 19910614.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 41601991 - 2³ = 41601983 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (41601961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20800995 + 20800996.

It is an arithmetic number, because the mean of its divisors is an integer number (20800996).

Almost surely, 2^41601991 is an apocalyptic number.

41601991 is a deficient number, since it is larger than the sum of its proper divisors (1).

41601991 is an equidigital number, since it uses as much as digits as its factorization.

41601991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1944, while the sum is 31.

The square root of 41601991 is about 6449.9605425150. The cubic root of 41601991 is about 346.5011698753.

The spelling of 41601991 in words is "forty-one million, six hundred one thousand, nine hundred ninety-one".