1111221091 has 2 divisors, whose sum is σ = 1111221092. Its totient is φ = 1111221090.

The previous prime is 1111221077. The next prime is 1111221107. The reversal of 1111221091 is 1901221111.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1111221091 - 2¹³ = 1111212899 is a prime.

It is not a weakly prime, because it can be changed into another prime (1111221791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 555610545 + 555610546.

It is an arithmetic number, because the mean of its divisors is an integer number (555610546).

Almost surely, 2^1111221091 is an apocalyptic number.

1111221091 is a deficient number, since it is larger than the sum of its proper divisors (1).

1111221091 is an equidigital number, since it uses as much as digits as its factorization.

1111221091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36, while the sum is 19.

The square root of 1111221091 is about 33334.9829908461. The cubic root of 1111221091 is about 1035.7783408324.

The spelling of 1111221091 in words is "one billion, one hundred eleven million, two hundred twenty-one thousand, ninety-one".