11355991 has 2 divisors, whose sum is σ = 11355992. Its totient is φ = 11355990.

The previous prime is 11355979. The next prime is 11356019. The reversal of 11355991 is 19955311.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 11355991 - 2¹⁵ = 11323223 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11355931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5677995 + 5677996.

It is an arithmetic number, because the mean of its divisors is an integer number (5677996).

Almost surely, 2^11355991 is an apocalyptic number.

11355991 is a deficient number, since it is larger than the sum of its proper divisors (1).

11355991 is an equidigital number, since it uses as much as digits as its factorization.

11355991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6075, while the sum is 34.

The square root of 11355991 is about 3369.8651308324. The cubic root of 11355991 is about 224.7717256837.

The spelling of 11355991 in words is "eleven million, three hundred fifty-five thousand, nine hundred ninety-one".