2001263545 has 8 divisors (see below), whose sum is σ = 2542782024. Its totient is φ = 1506833664.

The previous prime is 2001263533. The next prime is 2001263573. The reversal of 2001263545 is 5453621002.

It can be written as a sum of positive squares in 4 ways, for example, as 148133241 + 1853130304 = 12171^2 + 43048^2 .

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 2001263545 - 2¹³ = 2001255353 is a prime.

It is a Duffinian number.

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 7 ways as a sum of consecutive naturals, for example, 11772054 + ... + 11772223.

It is an arithmetic number, because the mean of its divisors is an integer number (317847753).

Almost surely, 2^2001263545 is an apocalyptic number.

It is an amenable number.

2001263545 is a deficient number, since it is larger than the sum of its proper divisors (541518479).

2001263545 is a wasteful number, since it uses less digits than its factorization.

2001263545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23544299.

The product of its (nonzero) digits is 7200, while the sum is 28.

The square root of 2001263545 is about 44735.4841820227. The cubic root of 2001263545 is about 1260.1863218627.

Adding to 2001263545 its reverse (5453621002), we get a palindrome (7454884547).

The spelling of 2001263545 in words is "two billion, one million, two hundred sixty-three thousand, five hundred forty-five".