63990187 has 2 divisors, whose sum is σ = 63990188. Its totient is φ = 63990186.

The previous prime is 63990103. The next prime is 63990203. The reversal of 63990187 is 78109936.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-63990187 is a prime.

It is not a weakly prime, because it can be changed into another prime (63790187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31995093 + 31995094.

It is an arithmetic number, because the mean of its divisors is an integer number (31995094).

Almost surely, 2^63990187 is an apocalyptic number.

63990187 is a deficient number, since it is larger than the sum of its proper divisors (1).

63990187 is an equidigital number, since it uses as much as digits as its factorization.

63990187 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 81648, while the sum is 43.

The square root of 63990187 is about 7999.3866639887. The cubic root of 63990187 is about 399.9795552050.

The spelling of 63990187 in words is "sixty-three million, nine hundred ninety thousand, one hundred eighty-seven".