2009041957 has 4 divisors (see below), whose sum is σ = 2163583660. Its totient is φ = 1854500256.

The previous prime is 2009041949. The next prime is 2009041987. The reversal of 2009041957 is 7591409002.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7591409002 = 2 ⋅3795704501.

It can be written as a sum of positive squares in 2 ways, for example, as 231070401 + 1777971556 = 15201^2 + 42166^2 .

It is a cyclic number.

It is not a de Polignac number, because 2009041957 - 2³ = 2009041949 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2009041987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 77270832 + ... + 77270857.

It is an arithmetic number, because the mean of its divisors is an integer number (540895915).

Almost surely, 2^2009041957 is an apocalyptic number.

It is an amenable number.

2009041957 is a deficient number, since it is larger than the sum of its proper divisors (154541703).

2009041957 is a wasteful number, since it uses less digits than its factorization.

2009041957 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 154541702.

The product of its (nonzero) digits is 22680, while the sum is 37.

The square root of 2009041957 is about 44822.3377011954. The cubic root of 2009041957 is about 1261.8168877375.

The spelling of 2009041957 in words is "two billion, nine million, forty-one thousand, nine hundred fifty-seven".