63988931 has 4 divisors (see below), whose sum is σ = 64197672. Its totient is φ = 63780192.

The previous prime is 63988927. The next prime is 63988937. The reversal of 63988931 is 13988936.

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

It is a cyclic number.

It is not a de Polignac number, because 63988931 - 2² = 63988927 is a prime.

It is a super-2 number, since 2×63988931² = 8189166581045522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (63988937) 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, 103910 + ... + 104523.

It is an arithmetic number, because the mean of its divisors is an integer number (16049418).

Almost surely, 2^63988931 is an apocalyptic number.

63988931 is a deficient number, since it is larger than the sum of its proper divisors (208741).

63988931 is a wasteful number, since it uses less digits than its factorization.

63988931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 208740.

The product of its digits is 279936, while the sum is 47.

The square root of 63988931 is about 7999.3081575846. The cubic root of 63988931 is about 399.9769382537.

The spelling of 63988931 in words is "sixty-three million, nine hundred eighty-eight thousand, nine hundred thirty-one".