1091540131 has 16 divisors (see below), whose sum is σ = 1273079808. Its totient is φ = 924854400.

The previous prime is 1091540123. The next prime is 1091540143. The reversal of 1091540131 is 1310451901.

It is not a de Polignac number, because 1091540131 - 2³ = 1091540123 is a prime.

It is a super-2 number, since 2×1091540131² = 2382919715166994322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1091540096 and 1091540105.

It is not an unprimeable number, because it can be changed into a prime (1091540731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9075 + ... + 47596.

It is an arithmetic number, because the mean of its divisors is an integer number (79567488).

Almost surely, 2^1091540131 is an apocalyptic number.

1091540131 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1091540131 is a deficient number, since it is larger than the sum of its proper divisors (181539677).

1091540131 is a wasteful number, since it uses less digits than its factorization.

1091540131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56802.

The product of its (nonzero) digits is 540, while the sum is 25.

The square root of 1091540131 is about 33038.4644164949. The cubic root of 1091540131 is about 1029.6269522837.

The spelling of 1091540131 in words is "one billion, ninety-one million, five hundred forty thousand, one hundred thirty-one".