63981099 has 24 divisors (see below), whose sum is σ = 113745632. Its totient is φ = 33747840.

The previous prime is 63981091. The next prime is 63981107. The reversal of 63981099 is 99018936.

63981099 is a `hidden beast` number, since 639 + 8 + 1 + 0 + 9 + 9 = 666.

It is an interprime number because it is at equal distance from previous prime (63981091) and next prime (63981107).

It is not a de Polignac number, because 63981099 - 2³ = 63981091 is a prime.

It is not an unprimeable number, because it can be changed into a prime (63981091) 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, 38242 + ... + 39879.

Almost surely, 2^63981099 is an apocalyptic number.

63981099 is a deficient number, since it is larger than the sum of its proper divisors (49764533).

63981099 is a wasteful number, since it uses less digits than its factorization.

63981099 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78147 (or 78144 counting only the distinct ones).

The product of its (nonzero) digits is 104976, while the sum is 45.

The square root of 63981099 is about 7998.8186002684. The cubic root of 63981099 is about 399.9606190396.

The spelling of 63981099 in words is "sixty-three million, nine hundred eighty-one thousand, ninety-nine".