2009012543 has 4 divisors (see below), whose sum is σ = 2015350440. Its totient is φ = 2002674648.

The previous prime is 2009012527. The next prime is 2009012549. The reversal of 2009012543 is 3452109002.

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

It is a cyclic number.

It is not a de Polignac number, because 2009012543 - 2⁴ = 2009012527 is a prime.

It is a super-2 number, since 2×2009012543² = 8072262795862653698, 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 (2009012549) 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, 3168473 + ... + 3169106.

It is an arithmetic number, because the mean of its divisors is an integer number (503837610).

Almost surely, 2^2009012543 is an apocalyptic number.

2009012543 is a deficient number, since it is larger than the sum of its proper divisors (6337897).

2009012543 is an equidigital number, since it uses as much as digits as its factorization.

2009012543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6337896.

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

The square root of 2009012543 is about 44822.0095823469. The cubic root of 2009012543 is about 1261.8107297006.

The spelling of 2009012543 in words is "two billion, nine million, twelve thousand, five hundred forty-three".