1125517191 has 4 divisors (see below), whose sum is σ = 1500689592. Its totient is φ = 750344792.

The previous prime is 1125517163. The next prime is 1125517201. The reversal of 1125517191 is 1917155211.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1125517191 - 2¹⁹ = 1124992903 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1125517391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 187586196 + ... + 187586201.

It is an arithmetic number, because the mean of its divisors is an integer number (375172398).

Almost surely, 2^1125517191 is an apocalyptic number.

1125517191 is a deficient number, since it is larger than the sum of its proper divisors (375172401).

1125517191 is an equidigital number, since it uses as much as digits as its factorization.

1125517191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 375172400.

The product of its digits is 3150, while the sum is 33.

The square root of 1125517191 is about 33548.7286048220. The cubic root of 1125517191 is about 1040.2012649803.

The spelling of 1125517191 in words is "one billion, one hundred twenty-five million, five hundred seventeen thousand, one hundred ninety-one".