11430991 has 24 divisors (see below), whose sum is σ = 13927760. Its totient is φ = 9369360.

The previous prime is 11430911. The next prime is 11431001. The reversal of 11430991 is 19903411.

It is a happy number.

It is not a de Polignac number, because 11430991 - 2⁷ = 11430863 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11430911) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 265816 + ... + 265858.

Almost surely, 2^11430991 is an apocalyptic number.

11430991 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

11430991 is a deficient number, since it is larger than the sum of its proper divisors (2496769).

11430991 is an equidigital number, since it uses as much as digits as its factorization.

11430991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104 (or 67 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 28.

The square root of 11430991 is about 3380.9748594156. The cubic root of 11430991 is about 225.2654710173.

It can be divided in two parts, 11430 and 991, that added together give a palindrome (12421).

The spelling of 11430991 in words is "eleven million, four hundred thirty thousand, nine hundred ninety-one".