1100989391 has 2 divisors, whose sum is σ = 1100989392. Its totient is φ = 1100989390.

The previous prime is 1100989339. The next prime is 1100989433. The reversal of 1100989391 is 1939890011.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1100989391 - 2⁶ = 1100989327 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1100989301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 550494695 + 550494696.

It is an arithmetic number, because the mean of its divisors is an integer number (550494696).

Almost surely, 2^1100989391 is an apocalyptic number.

1100989391 is a deficient number, since it is larger than the sum of its proper divisors (1).

1100989391 is an equidigital number, since it uses as much as digits as its factorization.

1100989391 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17496, while the sum is 41.

The square root of 1100989391 is about 33181.1601816452. The cubic root of 1100989391 is about 1032.5895162438.

The spelling of 1100989391 in words is "one billion, one hundred million, nine hundred eighty-nine thousand, three hundred ninety-one".