2001131225 has 24 divisors (see below), whose sum is σ = 2599536000. Its totient is φ = 1526091840.

The previous prime is 2001131219. The next prime is 2001131299. The reversal of 2001131225 is 5221311002.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-2001131225 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 39806 + ... + 74744.

It is an arithmetic number, because the mean of its divisors is an integer number (108314000).

Almost surely, 2^2001131225 is an apocalyptic number.

2001131225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

2001131225 is a deficient number, since it is larger than the sum of its proper divisors (598404775).

2001131225 is a wasteful number, since it uses less digits than its factorization.

2001131225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35057 (or 35052 counting only the distinct ones).

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

The square root of 2001131225 is about 44734.0052420974. The cubic root of 2001131225 is about 1260.1585474882.

Adding to 2001131225 its reverse (5221311002), we get a palindrome (7222442227).

The spelling of 2001131225 in words is "two billion, one million, one hundred thirty-one thousand, two hundred twenty-five".