1125115391 has 2 divisors, whose sum is σ = 1125115392. Its totient is φ = 1125115390.

The previous prime is 1125115373. The next prime is 1125115421. The reversal of 1125115391 is 1935115211.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1125115391 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1125115591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 562557695 + 562557696.

It is an arithmetic number, because the mean of its divisors is an integer number (562557696).

Almost surely, 2^1125115391 is an apocalyptic number.

1125115391 is a deficient number, since it is larger than the sum of its proper divisors (1).

1125115391 is an equidigital number, since it uses as much as digits as its factorization.

1125115391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1350, while the sum is 29.

The square root of 1125115391 is about 33542.7397658569. The cubic root of 1125115391 is about 1040.0774692662.

The spelling of 1125115391 in words is "one billion, one hundred twenty-five million, one hundred fifteen thousand, three hundred ninety-one".