2172154505 has 8 divisors (see below), whose sum is σ = 2619817992. Its totient is φ = 1728901888.

The previous prime is 2172154487. The next prime is 2172154511. The reversal of 2172154505 is 5054512712.

It can be written as a sum of positive squares in 4 ways, for example, as 698439184 + 1473715321 = 26428^2 + 38389^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 2172154505 - 2²⁶ = 2105045641 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1101632 + ... + 1103601.

It is an arithmetic number, because the mean of its divisors is an integer number (327477249).

Almost surely, 2^2172154505 is an apocalyptic number.

It is an amenable number.

2172154505 is a deficient number, since it is larger than the sum of its proper divisors (447663487).

2172154505 is a wasteful number, since it uses less digits than its factorization.

2172154505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2205435.

The product of its (nonzero) digits is 14000, while the sum is 32.

The square root of 2172154505 is about 46606.3783724932. The cubic root of 2172154505 is about 1295.0809180069.

The spelling of 2172154505 in words is "two billion, one hundred seventy-two million, one hundred fifty-four thousand, five hundred five".