63681121 has 4 divisors (see below), whose sum is σ = 72778432. Its totient is φ = 54583812.

The previous prime is 63681109. The next prime is 63681131. The reversal of 63681121 is 12118636.

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 a cyclic number.

It is not a de Polignac number, because 63681121 - 2⁷ = 63680993 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 63681121.

It is not an unprimeable number, because it can be changed into a prime (63681131) 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, 4548645 + ... + 4548658.

It is an arithmetic number, because the mean of its divisors is an integer number (18194608).

Almost surely, 2^63681121 is an apocalyptic number.

It is an amenable number.

63681121 is a deficient number, since it is larger than the sum of its proper divisors (9097311).

63681121 is an equidigital number, since it uses as much as digits as its factorization.

63681121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9097310.

The product of its digits is 1728, while the sum is 28.

The square root of 63681121 is about 7980.0451753107. The cubic root of 63681121 is about 399.3345623457.

Adding to 63681121 its reverse (12118636), we get a palindrome (75799757).

The spelling of 63681121 in words is "sixty-three million, six hundred eighty-one thousand, one hundred twenty-one".