2001223529 has 2 divisors, whose sum is σ = 2001223530. Its totient is φ = 2001223528.

The previous prime is 2001223453. The next prime is 2001223547. The reversal of 2001223529 is 9253221002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1463215504 + 538008025 = 38252^2 + 23195^2 .

It is a cyclic number.

It is not a de Polignac number, because 2001223529 - 2¹⁶ = 2001157993 is a prime.

It is a super-2 number, since 2×2001223529² = 8009791226046427682, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2001223498 and 2001223507.

It is not a weakly prime, because it can be changed into another prime (2001223129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1000611764 + 1000611765.

It is an arithmetic number, because the mean of its divisors is an integer number (1000611765).

Almost surely, 2^2001223529 is an apocalyptic number.

It is an amenable number.

2001223529 is a deficient number, since it is larger than the sum of its proper divisors (1).

2001223529 is an equidigital number, since it uses as much as digits as its factorization.

2001223529 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 2001223529 is about 44735.0369285642. The cubic root of 2001223529 is about 1260.1779225105.

The spelling of 2001223529 in words is "two billion, one million, two hundred twenty-three thousand, five hundred twenty-nine".