1135991371 has 4 divisors (see below), whose sum is σ = 1137845152. Its totient is φ = 1134137592.

The previous prime is 1135991333. The next prime is 1135991377. The reversal of 1135991371 is 1731995311.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1135991371 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1135991377) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 925971 + ... + 927196.

It is an arithmetic number, because the mean of its divisors is an integer number (284461288).

Almost surely, 2^1135991371 is an apocalyptic number.

1135991371 is a deficient number, since it is larger than the sum of its proper divisors (1853781).

1135991371 is an equidigital number, since it uses as much as digits as its factorization.

1135991371 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1853780.

The product of its digits is 25515, while the sum is 40.

The square root of 1135991371 is about 33704.4710832257. The cubic root of 1135991371 is about 1043.4180473245.

The spelling of 1135991371 in words is "one billion, one hundred thirty-five million, nine hundred ninety-one thousand, three hundred seventy-one".