10531991 has 4 divisors (see below), whose sum is σ = 10545192. Its totient is φ = 10518792.

The previous prime is 10531987. The next prime is 10532003. The reversal of 10531991 is 19913501.

10531991 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.

It is a cyclic number.

It is not a de Polignac number, because 10531991 - 2² = 10531987 is a prime.

It is a super-2 number, since 2×10531991² = 221845668848162, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10531921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5321 + ... + 7026.

It is an arithmetic number, because the mean of its divisors is an integer number (2636298).

Almost surely, 2^10531991 is an apocalyptic number.

10531991 is a deficient number, since it is larger than the sum of its proper divisors (13201).

10531991 is an equidigital number, since it uses as much as digits as its factorization.

10531991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13200.

The product of its (nonzero) digits is 1215, while the sum is 29.

The square root of 10531991 is about 3245.3029134427. The cubic root of 10531991 is about 219.1981207215.

The spelling of 10531991 in words is "ten million, five hundred thirty-one thousand, nine hundred ninety-one".