2001231125 has 16 divisors (see below), whose sum is σ = 2531760816. Its totient is φ = 1579046400.

The previous prime is 2001231091. The next prime is 2001231131. The reversal of 2001231125 is 5211321002.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 91278916 + 1909952209 = 9554^2 + 43703^2 .

It is not a de Polignac number, because 2001231125 - 2¹⁶ = 2001165589 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 100532 + ... + 118781.

It is an arithmetic number, because the mean of its divisors is an integer number (158235051).

Almost surely, 2^2001231125 is an apocalyptic number.

2001231125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

2001231125 is a deficient number, since it is larger than the sum of its proper divisors (530529691).

2001231125 is an equidigital number, since it uses as much as digits as its factorization.

2001231125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 219401 (or 219391 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 2001231125 is about 44735.1218283800. The cubic root of 2001231125 is about 1260.1795169183.

Adding to 2001231125 its reverse (5211321002), we get a palindrome (7212552127).

The spelling of 2001231125 in words is "two billion, one million, two hundred thirty-one thousand, one hundred twenty-five".