2001223453 has 2 divisors, whose sum is σ = 2001223454. Its totient is φ = 2001223452.

The previous prime is 2001223451. The next prime is 2001223529. The reversal of 2001223453 is 3543221002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1497535204 + 503688249 = 38698^2 + 22443^2 .

It is a cyclic number.

It is not a de Polignac number, because 2001223453 - 2¹ = 2001223451 is a prime.

Together with 2001223451, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2001223451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1000611726 + 1000611727.

It is an arithmetic number, because the mean of its divisors is an integer number (1000611727).

Almost surely, 2^2001223453 is an apocalyptic number.

It is an amenable number.

2001223453 is a deficient number, since it is larger than the sum of its proper divisors (1).

2001223453 is an equidigital number, since it uses as much as digits as its factorization.

2001223453 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1440, while the sum is 22.

The square root of 2001223453 is about 44735.0360791181. The cubic root of 2001223453 is about 1260.1779065580.

Adding to 2001223453 its reverse (3543221002), we get a palindrome (5544444455).

The spelling of 2001223453 in words is "two billion, one million, two hundred twenty-three thousand, four hundred fifty-three".