1001001125 has 8 divisors (see below), whose sum is σ = 1249249560. Its totient is φ = 800800800.

The previous prime is 1001001119. The next prime is 1001001137. The reversal of 1001001125 is 5211001001.

It can be written as a sum of positive squares in 4 ways, for example, as 102860164 + 898140961 = 10142^2 + 29969^2 .

It is not a de Polignac number, because 1001001125 - 2⁶ = 1001001061 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4003880 + ... + 4004129.

It is an arithmetic number, because the mean of its divisors is an integer number (156156195).

Almost surely, 2^1001001125 is an apocalyptic number.

It is an amenable number.

1001001125 is a deficient number, since it is larger than the sum of its proper divisors (248248435).

1001001125 is an frugal number, since it uses more digits than its factorization.

1001001125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8008024 (or 8008014 counting only the distinct ones).

The product of its (nonzero) digits is 10, while the sum is 11.

The square root of 1001001125 is about 31638.6018180324. The cubic root of 1001001125 is about 1000.3335970340. Note that the first 3 decimals are identical.

Adding to 1001001125 its reverse (5211001001), we get a palindrome (6212002126).

The spelling of 1001001125 in words is "one billion, one million, one thousand, one hundred twenty-five".