1091409157 has 4 divisors (see below), whose sum is σ = 1126615936. Its totient is φ = 1056202380.

The previous prime is 1091409149. The next prime is 1091409161. The reversal of 1091409157 is 7519041901.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1091409157 - 2³ = 1091409149 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1091409857) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17603343 + ... + 17603404.

It is an arithmetic number, because the mean of its divisors is an integer number (281653984).

Almost surely, 2^1091409157 is an apocalyptic number.

It is an amenable number.

1091409157 is a deficient number, since it is larger than the sum of its proper divisors (35206779).

1091409157 is an equidigital number, since it uses as much as digits as its factorization.

1091409157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35206778.

The product of its (nonzero) digits is 11340, while the sum is 37.

The square root of 1091409157 is about 33036.4822128507. The cubic root of 1091409157 is about 1029.5857689591.

The spelling of 1091409157 in words is "one billion, ninety-one million, four hundred nine thousand, one hundred fifty-seven".