10487891 has 4 divisors (see below), whose sum is σ = 10506000. Its totient is φ = 10469784.

The previous prime is 10487887. The next prime is 10487921. The reversal of 10487891 is 19878401.

10487891 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19878401 = 673 ⋅29537.

It is a cyclic number.

It is not a de Polignac number, because 10487891 - 2² = 10487887 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (10487801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8156 + ... + 9353.

It is an arithmetic number, because the mean of its divisors is an integer number (2626500).

Almost surely, 2^10487891 is an apocalyptic number.

10487891 is a deficient number, since it is larger than the sum of its proper divisors (18109).

10487891 is an equidigital number, since it uses as much as digits as its factorization.

10487891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18108.

The product of its (nonzero) digits is 16128, while the sum is 38.

The square root of 10487891 is about 3238.5013509338. The cubic root of 10487891 is about 218.8917474764.

The spelling of 10487891 in words is "ten million, four hundred eighty-seven thousand, eight hundred ninety-one".