10891631 has 4 divisors (see below), whose sum is σ = 10910592. Its totient is φ = 10872672.

The previous prime is 10891591. The next prime is 10891649. The reversal of 10891631 is 13619801.

It is a happy number.

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 10891631 - 2¹⁴ = 10875247 is a prime.

It is a super-2 number, since 2×10891631² = 237255251680322, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 13.

It is a junction number, because it is equal to n+sod(n) for n = 10891594 and 10891603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10891831) 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, 8591 + ... + 9776.

It is an arithmetic number, because the mean of its divisors is an integer number (2727648).

Almost surely, 2^10891631 is an apocalyptic number.

10891631 is a deficient number, since it is larger than the sum of its proper divisors (18961).

10891631 is an equidigital number, since it uses as much as digits as its factorization.

10891631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18960.

The product of its (nonzero) digits is 1296, while the sum is 29.

The square root of 10891631 is about 3300.2471119600. The cubic root of 10891631 is about 221.6652626465.

The spelling of 10891631 in words is "ten million, eight hundred ninety-one thousand, six hundred thirty-one".