11530991 has 2 divisors, whose sum is σ = 11530992. Its totient is φ = 11530990.

The previous prime is 11530957. The next prime is 11530997. The reversal of 11530991 is 19903511.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 11530991 - 2⁶ = 11530927 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11530997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5765495 + 5765496.

It is an arithmetic number, because the mean of its divisors is an integer number (5765496).

Almost surely, 2^11530991 is an apocalyptic number.

11530991 is a deficient number, since it is larger than the sum of its proper divisors (1).

11530991 is an equidigital number, since it uses as much as digits as its factorization.

11530991 is an evil number, because the sum of its binary digits is even.

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

The square root of 11530991 is about 3395.7312909004. The cubic root of 11530991 is about 225.9204499829.

It can be divided in two parts, 11530 and 991, that added together give a palindrome (12521).

The spelling of 11530991 in words is "eleven million, five hundred thirty thousand, nine hundred ninety-one".