1331110091 has 2 divisors, whose sum is σ = 1331110092. Its totient is φ = 1331110090.

The previous prime is 1331110087. The next prime is 1331110103. The reversal of 1331110091 is 1900111331.

It is a weak prime.

It is an emirp because it is prime and its reverse (1900111331) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1331110091 - 2² = 1331110087 is a prime.

It is not a weakly prime, because it can be changed into another prime (1331110691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 665555045 + 665555046.

It is an arithmetic number, because the mean of its divisors is an integer number (665555046).

Almost surely, 2^1331110091 is an apocalyptic number.

1331110091 is a deficient number, since it is larger than the sum of its proper divisors (1).

1331110091 is an equidigital number, since it uses as much as digits as its factorization.

1331110091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 81, while the sum is 20.

The square root of 1331110091 is about 36484.3814665947. The cubic root of 1331110091 is about 1100.0303272630.

The spelling of 1331110091 in words is "one billion, three hundred thirty-one million, one hundred ten thousand, ninety-one".