41975821 has 4 divisors (see below), whose sum is σ = 41989500. Its totient is φ = 41962144.

The previous prime is 41975777. The next prime is 41975827. The reversal of 41975821 is 12857914.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 12857914 = 2 ⋅6428957.

It can be written as a sum of positive squares in 2 ways, for example, as 41602500 + 373321 = 6450^2 + 611^2 .

It is a cyclic number.

It is not a de Polignac number, because 41975821 - 2¹⁷ = 41844749 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 (41975827) 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, 135 + ... + 9163.

It is an arithmetic number, because the mean of its divisors is an integer number (10497375).

Almost surely, 2^41975821 is an apocalyptic number.

It is an amenable number.

41975821 is a deficient number, since it is larger than the sum of its proper divisors (13679).

41975821 is an equidigital number, since it uses as much as digits as its factorization.

41975821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13678.

The product of its digits is 20160, while the sum is 37.

The square root of 41975821 is about 6478.8749795007. The cubic root of 41975821 is about 347.5359478365.

The spelling of 41975821 in words is "forty-one million, nine hundred seventy-five thousand, eight hundred twenty-one".