63541821 has 16 divisors (see below), whose sum is σ = 97686144. Its totient is φ = 35986944.

The previous prime is 63541811. The next prime is 63541837. The reversal of 63541821 is 12814536.

It is not a de Polignac number, because 63541821 - 2⁵ = 63541789 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63541811) 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, 11016 + ... + 15761.

It is an arithmetic number, because the mean of its divisors is an integer number (6105384).

Almost surely, 2^63541821 is an apocalyptic number.

It is an amenable number.

63541821 is a deficient number, since it is larger than the sum of its proper divisors (34144323).

63541821 is a wasteful number, since it uses less digits than its factorization.

63541821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26900.

The product of its digits is 5760, while the sum is 30.

The square root of 63541821 is about 7971.3123762653. The cubic root of 63541821 is about 399.0431734490.

The spelling of 63541821 in words is "sixty-three million, five hundred forty-one thousand, eight hundred twenty-one".