2156173449 has 8 divisors (see below), whose sum is σ = 2876724960. Its totient is φ = 1436535456.

The previous prime is 2156173441. The next prime is 2156173451. The reversal of 2156173449 is 9443716512.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2156173449 - 2³ = 2156173441 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2156173449.

It is not an unprimeable number, because it can be changed into a prime (2156173441) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 222852 + ... + 232325.

It is an arithmetic number, because the mean of its divisors is an integer number (359590620).

Almost surely, 2^2156173449 is an apocalyptic number.

It is an amenable number.

2156173449 is a deficient number, since it is larger than the sum of its proper divisors (720551511).

2156173449 is a wasteful number, since it uses less digits than its factorization.

2156173449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 456759.

The product of its digits is 181440, while the sum is 42.

The square root of 2156173449 is about 46434.6147717411. The cubic root of 2156173449 is about 1291.8970244571.

The spelling of 2156173449 in words is "two billion, one hundred fifty-six million, one hundred seventy-three thousand, four hundred forty-nine".