1121280091 has 2 divisors, whose sum is σ = 1121280092. Its totient is φ = 1121280090.

The previous prime is 1121280089. The next prime is 1121280103. The reversal of 1121280091 is 1900821211.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1121280091 - 2¹ = 1121280089 is a prime.

Together with 1121280089, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1121280011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 560640045 + 560640046.

It is an arithmetic number, because the mean of its divisors is an integer number (560640046).

Almost surely, 2^1121280091 is an apocalyptic number.

1121280091 is a deficient number, since it is larger than the sum of its proper divisors (1).

1121280091 is an equidigital number, since it uses as much as digits as its factorization.

1121280091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 25.

The square root of 1121280091 is about 33485.5206171264. The cubic root of 1121280091 is about 1038.8943164568.

The spelling of 1121280091 in words is "one billion, one hundred twenty-one million, two hundred eighty thousand, ninety-one".