2009557 has 4 divisors (see below), whose sum is σ = 2192256. Its totient is φ = 1826860.

The previous prime is 2009543. The next prime is 2009593. The reversal of 2009557 is 7559002.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2009557 - 2¹⁵ = 1976789 is a prime.

2009557 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2009537) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 91333 + ... + 91354.

It is an arithmetic number, because the mean of its divisors is an integer number (548064).

2^2009557 is an apocalyptic number.

It is an amenable number.

2009557 is a deficient number, since it is larger than the sum of its proper divisors (182699).

2009557 is a wasteful number, since it uses less digits than its factorization.

2009557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 182698.

The product of its (nonzero) digits is 3150, while the sum is 28.

The square root of 2009557 is about 1417.5884452125. The cubic root of 2009557 is about 126.1924706031.

The spelling of 2009557 in words is "two million, nine thousand, five hundred fifty-seven".