63198891 has 24 divisors (see below), whose sum is σ = 104573664. Its totient is φ = 36028800.

The previous prime is 63198881. The next prime is 63198893. The reversal of 63198891 is 19889136.

63198891 is a `hidden beast` number, since 631 + 9 + 8 + 8 + 9 + 1 = 666.

It is not a de Polignac number, because 63198891 - 2¹¹ = 63196843 is a prime.

It is not an unprimeable number, because it can be changed into a prime (63198893) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 34191 + ... + 35991.

It is an arithmetic number, because the mean of its divisors is an integer number (4357236).

Almost surely, 2^63198891 is an apocalyptic number.

63198891 is a deficient number, since it is larger than the sum of its proper divisors (41374773).

63198891 is a wasteful number, since it uses less digits than its factorization.

63198891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2371 (or 2368 counting only the distinct ones).

The product of its digits is 93312, while the sum is 45.

The square root of 63198891 is about 7949.7730156276. The cubic root of 63198891 is about 398.3240103714.

The spelling of 63198891 in words is "sixty-three million, one hundred ninety-eight thousand, eight hundred ninety-one".