63523813 has 4 divisors (see below), whose sum is σ = 63591840. Its totient is φ = 63455788.

The previous prime is 63523807. The next prime is 63523819. The reversal of 63523813 is 31832536.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (63523807) and next prime (63523819).

It is a cyclic number.

It is not a de Polignac number, because 63523813 - 2¹⁷ = 63392741 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 (63523819) 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, 32593 + ... + 34486.

It is an arithmetic number, because the mean of its divisors is an integer number (15897960).

Almost surely, 2^63523813 is an apocalyptic number.

It is an amenable number.

63523813 is a deficient number, since it is larger than the sum of its proper divisors (68027).

63523813 is an equidigital number, since it uses as much as digits as its factorization.

63523813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68026.

The product of its digits is 12960, while the sum is 31.

The square root of 63523813 is about 7970.1827457092. The cubic root of 63523813 is about 399.0054730899.

The spelling of 63523813 in words is "sixty-three million, five hundred twenty-three thousand, eight hundred thirteen".