10113991 has 4 divisors (see below), whose sum is σ = 10151584. Its totient is φ = 10076400.

The previous prime is 10113989. The next prime is 10114007. The reversal of 10113991 is 19931101.

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 10113991 - 2¹ = 10113989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10113911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18390 + ... + 18931.

It is an arithmetic number, because the mean of its divisors is an integer number (2537896).

Almost surely, 2^10113991 is an apocalyptic number.

10113991 is a deficient number, since it is larger than the sum of its proper divisors (37593).

10113991 is an equidigital number, since it uses as much as digits as its factorization.

10113991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37592.

The product of its (nonzero) digits is 243, while the sum is 25.

The square root of 10113991 is about 3180.2501473941. The cubic root of 10113991 is about 216.2589985898.

The spelling of 10113991 in words is "ten million, one hundred thirteen thousand, nine hundred ninety-one".