1125399187 has 8 divisors (see below), whose sum is σ = 1247835312. Its totient is φ = 1006317600.

The previous prime is 1125399181. The next prime is 1125399199. The reversal of 1125399187 is 7819935211.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1125399187 - 2⁷ = 1125399059 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1125399181) 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 7 ways as a sum of consecutive naturals, for example, 837928 + ... + 839269.

It is an arithmetic number, because the mean of its divisors is an integer number (155979414).

Almost surely, 2^1125399187 is an apocalyptic number.

1125399187 is a deficient number, since it is larger than the sum of its proper divisors (122436125).

1125399187 is a wasteful number, since it uses less digits than its factorization.

1125399187 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1677269.

The product of its digits is 136080, while the sum is 46.

The square root of 1125399187 is about 33546.9698631635. The cubic root of 1125399187 is about 1040.1649106711.

The spelling of 1125399187 in words is "one billion, one hundred twenty-five million, three hundred ninety-nine thousand, one hundred eighty-seven".