2152118917 has 4 divisors (see below), whose sum is σ = 2317666540. Its totient is φ = 1986571296.

The previous prime is 2152118909. The next prime is 2152118939. The reversal of 2152118917 is 7198112512.

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 1331812036 + 820306881 = 36494^2 + 28641^2 .

It is a cyclic number.

It is not a de Polignac number, because 2152118917 - 2³ = 2152118909 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 (2152118957) 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, 82773792 + ... + 82773817.

It is an arithmetic number, because the mean of its divisors is an integer number (579416635).

Almost surely, 2^2152118917 is an apocalyptic number.

It is an amenable number.

2152118917 is a deficient number, since it is larger than the sum of its proper divisors (165547623).

2152118917 is a wasteful number, since it uses less digits than its factorization.

2152118917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165547622.

The product of its digits is 10080, while the sum is 37.

The square root of 2152118917 is about 46390.9357202460. The cubic root of 2152118917 is about 1291.0867426256.

The spelling of 2152118917 in words is "two billion, one hundred fifty-two million, one hundred eighteen thousand, nine hundred seventeen".