2155004917 has 4 divisors (see below), whose sum is σ = 2320774540. Its totient is φ = 1989235296.

The previous prime is 2155004903. The next prime is 2155004921. The reversal of 2155004917 is 7194005512.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1447498116 + 707506801 = 38046^2 + 26599^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2155004917 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 (2155004317) 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, 82884792 + ... + 82884817.

It is an arithmetic number, because the mean of its divisors is an integer number (580193635).

Almost surely, 2^2155004917 is an apocalyptic number.

It is an amenable number.

2155004917 is a deficient number, since it is larger than the sum of its proper divisors (165769623).

2155004917 is a wasteful number, since it uses less digits than its factorization.

2155004917 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165769622.

The product of its (nonzero) digits is 12600, while the sum is 34.

The square root of 2155004917 is about 46422.0305135396. The cubic root of 2155004917 is about 1291.6636023255.

The spelling of 2155004917 in words is "two billion, one hundred fifty-five million, four thousand, nine hundred seventeen".