1917144009 has 24 divisors (see below), whose sum is σ = 3198660192. Its totient is φ = 1093557120.

The previous prime is 1917143999. The next prime is 1917144079. The reversal of 1917144009 is 9004417191.

It is not a de Polignac number, because 1917144009 - 2²¹ = 1915046857 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (1917144079) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 567879 + ... + 571244.

It is an arithmetic number, because the mean of its divisors is an integer number (133277508).

Almost surely, 2^1917144009 is an apocalyptic number.

It is an amenable number.

1917144009 is a deficient number, since it is larger than the sum of its proper divisors (1281516183).

1917144009 is a wasteful number, since it uses less digits than its factorization.

1917144009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1139157 (or 1139154 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 36.

The square root of 1917144009 is about 43785.2030827767. The cubic root of 1917144009 is about 1242.2764307263.

The spelling of 1917144009 in words is "one billion, nine hundred seventeen million, one hundred forty-four thousand, nine".