10188991 has 2 divisors, whose sum is σ = 10188992. Its totient is φ = 10188990.

The previous prime is 10188973. The next prime is 10189031. The reversal of 10188991 is 19988101.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-10188991 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 10188991.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10188901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5094495 + 5094496.

It is an arithmetic number, because the mean of its divisors is an integer number (5094496).

Almost surely, 2^10188991 is an apocalyptic number.

10188991 is a deficient number, since it is larger than the sum of its proper divisors (1).

10188991 is an equidigital number, since it uses as much as digits as its factorization.

10188991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 37.

The square root of 10188991 is about 3192.0198934217. The cubic root of 10188991 is about 216.7922367445.

The spelling of 10188991 in words is "ten million, one hundred eighty-eight thousand, nine hundred ninety-one".