1125105491 has 2 divisors, whose sum is σ = 1125105492. Its totient is φ = 1125105490.

The previous prime is 1125105479. The next prime is 1125105493. The reversal of 1125105491 is 1945015211.

It is a strong prime.

It is an emirp because it is prime and its reverse (1945015211) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1125105491 - 2⁶ = 1125105427 is a prime.

Together with 1125105493, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1125105493) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 562552745 + 562552746.

It is an arithmetic number, because the mean of its divisors is an integer number (562552746).

Almost surely, 2^1125105491 is an apocalyptic number.

1125105491 is a deficient number, since it is larger than the sum of its proper divisors (1).

1125105491 is an equidigital number, since it uses as much as digits as its factorization.

1125105491 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1800, while the sum is 29.

The square root of 1125105491 is about 33542.5921926139. The cubic root of 1125105491 is about 1040.0744186762.

The spelling of 1125105491 in words is "one billion, one hundred twenty-five million, one hundred five thousand, four hundred ninety-one".