1125289391 has 2 divisors, whose sum is σ = 1125289392. Its totient is φ = 1125289390.

The previous prime is 1125289327. The next prime is 1125289393. The reversal of 1125289391 is 1939825211.

It is a strong prime.

It is an emirp because it is prime and its reverse (1939825211) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1125289391 - 2⁶ = 1125289327 is a prime.

Together with 1125289393, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1125289393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 562644695 + 562644696.

It is an arithmetic number, because the mean of its divisors is an integer number (562644696).

Almost surely, 2^1125289391 is an apocalyptic number.

1125289391 is a deficient number, since it is larger than the sum of its proper divisors (1).

1125289391 is an equidigital number, since it uses as much as digits as its factorization.

1125289391 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 38880, while the sum is 41.

The square root of 1125289391 is about 33545.3333714244. Note that the first 4 decimals coincide. The cubic root of 1125289391 is about 1040.1310827748.

The spelling of 1125289391 in words is "one billion, one hundred twenty-five million, two hundred eighty-nine thousand, three hundred ninety-one".