2001223547 has 2 divisors, whose sum is σ = 2001223548. Its totient is φ = 2001223546.

The previous prime is 2001223529. The next prime is 2001223573. The reversal of 2001223547 is 7453221002.

It is an a-pointer prime, because the next prime (2001223573) can be obtained adding 2001223547 to its sum of digits (26).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2001223547 - 2¹⁶ = 2001158011 is a prime.

It is a super-2 number, since 2×2001223547² = 8009791370134522418, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2001223597) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1000611773 + 1000611774.

It is an arithmetic number, because the mean of its divisors is an integer number (1000611774).

Almost surely, 2^2001223547 is an apocalyptic number.

2001223547 is a deficient number, since it is larger than the sum of its proper divisors (1).

2001223547 is an equidigital number, since it uses as much as digits as its factorization.

2001223547 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3360, while the sum is 26.

The square root of 2001223547 is about 44735.0371297488. The cubic root of 2001223547 is about 1260.1779262887.

Adding to 2001223547 its reverse (7453221002), we get a palindrome (9454444549).

The spelling of 2001223547 in words is "two billion, one million, two hundred twenty-three thousand, five hundred forty-seven".