2001132451 has 4 divisors (see below), whose sum is σ = 2002169632. Its totient is φ = 2000095272.

The previous prime is 2001132437. The next prime is 2001132467. The reversal of 2001132451 is 1542311002.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2001132451 - 2¹¹ = 2001130403 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2001132251) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 515691 + ... + 519556.

It is an arithmetic number, because the mean of its divisors is an integer number (500542408).

Almost surely, 2^2001132451 is an apocalyptic number.

2001132451 is a deficient number, since it is larger than the sum of its proper divisors (1037181).

2001132451 is a wasteful number, since it uses less digits than its factorization.

2001132451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1037180.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 2001132451 is about 44734.0189453172. The cubic root of 2001132451 is about 1260.1588048350.

Adding to 2001132451 its reverse (1542311002), we get a palindrome (3543443453).

The spelling of 2001132451 in words is "two billion, one million, one hundred thirty-two thousand, four hundred fifty-one".