1135855891 has 8 divisors (see below), whose sum is σ = 1213484480. Its totient is φ = 1060012008.

The previous prime is 1135855873. The next prime is 1135855979. The reversal of 1135855891 is 1985585311.

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 1135855891 - 2⁹ = 1135855379 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1135855811) 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, 444861 + ... + 447406.

It is an arithmetic number, because the mean of its divisors is an integer number (151685560).

Almost surely, 2^1135855891 is an apocalyptic number.

1135855891 is a deficient number, since it is larger than the sum of its proper divisors (77628589).

1135855891 is an equidigital number, since it uses as much as digits as its factorization.

1135855891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 892353.

The product of its digits is 216000, while the sum is 46.

The square root of 1135855891 is about 33702.4612009272. The cubic root of 1135855891 is about 1043.3765658189.

The spelling of 1135855891 in words is "one billion, one hundred thirty-five million, eight hundred fifty-five thousand, eight hundred ninety-one".