11409991 has 2 divisors, whose sum is σ = 11409992. Its totient is φ = 11409990.

The previous prime is 11409977. The next prime is 11410037. The reversal of 11409991 is 19990411.

It is a happy number.

11409991 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 11409991 - 2¹⁹ = 10885703 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11409911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5704995 + 5704996.

It is an arithmetic number, because the mean of its divisors is an integer number (5704996).

Almost surely, 2^11409991 is an apocalyptic number.

11409991 is a deficient number, since it is larger than the sum of its proper divisors (1).

11409991 is an equidigital number, since it uses as much as digits as its factorization.

11409991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2916, while the sum is 34.

The square root of 11409991 is about 3377.8678186098. The cubic root of 11409991 is about 225.1274405609.

The spelling of 11409991 in words is "eleven million, four hundred nine thousand, nine hundred ninety-one".