2009091956 has 6 divisors (see below), whose sum is σ = 3515910930. Its totient is φ = 1004545976.

The previous prime is 2009091947. The next prime is 2009091983. The reversal of 2009091956 is 6591909002.

It can be written as a sum of positive squares in only one way, i.e., 1878355600 + 130736356 = 43340^2 + 11434^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 251136491 + ... + 251136498.

It is an arithmetic number, because the mean of its divisors is an integer number (585985155).

Almost surely, 2^2009091956 is an apocalyptic number.

It is an amenable number.

2009091956 is a deficient number, since it is larger than the sum of its proper divisors (1506818974).

2009091956 is a wasteful number, since it uses less digits than its factorization.

2009091956 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 502272993 (or 502272991 counting only the distinct ones).

The product of its (nonzero) digits is 43740, while the sum is 41.

The square root of 2009091956 is about 44822.8954441812. The cubic root of 2009091956 is about 1261.8273552572.

The spelling of 2009091956 in words is "two billion, nine million, ninety-one thousand, nine hundred fifty-six".