63540013 has 4 divisors (see below), whose sum is σ = 64102428. Its totient is φ = 62977600.

The previous prime is 63539981. The next prime is 63540017. The reversal of 63540013 is 31004536.

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

It can be written as a sum of positive squares in 2 ways, for example, as 17123044 + 46416969 = 4138^2 + 6813^2 .

It is a cyclic number.

It is not a de Polignac number, because 63540013 - 2⁵ = 63539981 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63540017) 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, 281038 + ... + 281263.

It is an arithmetic number, because the mean of its divisors is an integer number (16025607).

Almost surely, 2^63540013 is an apocalyptic number.

It is an amenable number.

63540013 is a deficient number, since it is larger than the sum of its proper divisors (562415).

63540013 is a wasteful number, since it uses less digits than its factorization.

63540013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 562414.

The product of its (nonzero) digits is 1080, while the sum is 22.

The square root of 63540013 is about 7971.1989687876. The cubic root of 63540013 is about 399.0393886614.

Adding to 63540013 its reverse (31004536), we get a palindrome (94544549).

The spelling of 63540013 in words is "sixty-three million, five hundred forty thousand, thirteen".