1091118131 has 4 divisors (see below), whose sum is σ = 1106486064. Its totient is φ = 1075750200.

The previous prime is 1091118107. The next prime is 1091118139. The reversal of 1091118131 is 1318111901.

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

It is a cyclic number.

It is not a de Polignac number, because 1091118131 - 2¹⁴ = 1091101747 is a prime.

It is a super-2 number, since 2×1091118131² = 2381077551593866322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1091118131.

It is not an unprimeable number, because it can be changed into a prime (1091118139) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7683860 + ... + 7684001.

It is an arithmetic number, because the mean of its divisors is an integer number (276621516).

Almost surely, 2^1091118131 is an apocalyptic number.

1091118131 is a deficient number, since it is larger than the sum of its proper divisors (15367933).

1091118131 is an equidigital number, since it uses as much as digits as its factorization.

1091118131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15367932.

The product of its (nonzero) digits is 216, while the sum is 26.

The square root of 1091118131 is about 33032.0773037361. The cubic root of 1091118131 is about 1029.4942472590.

The spelling of 1091118131 in words is "one billion, ninety-one million, one hundred eighteen thousand, one hundred thirty-one".