2001523453 has 4 divisors (see below), whose sum is σ = 2009311740. Its totient is φ = 1993735168.

The previous prime is 2001523427. The next prime is 2001523477. The reversal of 2001523453 is 3543251002.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1848828004 + 152695449 = 42998^2 + 12357^2 .

It is a cyclic number.

It is not a de Polignac number, because 2001523453 - 2²¹ = 1999426301 is a prime.

It is a super-2 number, since 2×2001523453² = 8012192265818086418, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2001520453) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3893758 + ... + 3894271.

It is an arithmetic number, because the mean of its divisors is an integer number (502327935).

Almost surely, 2^2001523453 is an apocalyptic number.

It is an amenable number.

2001523453 is a deficient number, since it is larger than the sum of its proper divisors (7788287).

2001523453 is an equidigital number, since it uses as much as digits as its factorization.

2001523453 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7788286.

The product of its (nonzero) digits is 3600, while the sum is 25.

The square root of 2001523453 is about 44738.3890300042. The cubic root of 2001523453 is about 1260.2408737864.

Adding to 2001523453 its reverse (3543251002), we get a palindrome (5544774455).

The spelling of 2001523453 in words is "two billion, one million, five hundred twenty-three thousand, four hundred fifty-three".