1135991 has 8 divisors (see below), whose sum is σ = 1266480. Its totient is φ = 1012608.

The previous prime is 1135969. The next prime is 1135997. The reversal of 1135991 is 1995311.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1135991 - 2¹⁰ = 1134967 is a prime.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a zygodrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1135997) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1436 + ... + 2081.

It is an arithmetic number, because the mean of its divisors is an integer number (158310).

2^1135991 is an apocalyptic number.

1135991 is a deficient number, since it is larger than the sum of its proper divisors (130489).

1135991 is a wasteful number, since it uses less digits than its factorization.

1135991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3553.

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

The square root of 1135991 is about 1065.8287854998. The cubic root of 1135991 is about 104.3417933736.

The spelling of 1135991 in words is "one million, one hundred thirty-five thousand, nine hundred ninety-one".