1131001091 has 16 divisors (see below), whose sum is σ = 1267895808. Its totient is φ = 1000058400.

The previous prime is 1131001019. The next prime is 1131001097. The reversal of 1131001091 is 1901001311.

It is a de Polignac number, because none of the positive numbers 2^k-1131001091 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1131001097) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 77561 + ... + 90981.

It is an arithmetic number, because the mean of its divisors is an integer number (79243488).

Almost surely, 2^1131001091 is an apocalyptic number.

1131001091 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1131001091 is a deficient number, since it is larger than the sum of its proper divisors (136894717).

1131001091 is a wasteful number, since it uses less digits than its factorization.

1131001091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13642.

The product of its (nonzero) digits is 27, while the sum is 17.

The square root of 1131001091 is about 33630.3596620672. The cubic root of 1131001091 is about 1041.8879325960.

The spelling of 1131001091 in words is "one billion, one hundred thirty-one million, one thousand, ninety-one".