1125121999 has 8 divisors (see below), whose sum is σ = 1192086720. Its totient is φ = 1058244096.

The previous prime is 1125121997. The next prime is 1125122023. The reversal of 1125121999 is 9991215211.

It is a happy number.

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 1125121999 - 2¹ = 1125121997 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1125121997) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6007 + ... + 47815.

It is an arithmetic number, because the mean of its divisors is an integer number (149010840).

Almost surely, 2^1125121999 is an apocalyptic number.

1125121999 is a deficient number, since it is larger than the sum of its proper divisors (66964721).

1125121999 is a wasteful number, since it uses less digits than its factorization.

1125121999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43409.

The product of its digits is 14580, while the sum is 40.

The square root of 1125121999 is about 33542.8382669088. The cubic root of 1125121999 is about 1040.0795054480.

The spelling of 1125121999 in words is "one billion, one hundred twenty-five million, one hundred twenty-one thousand, nine hundred ninety-nine".