2157149705 has 8 divisors (see below), whose sum is σ = 2724820800. Its totient is φ = 1634892336.

The previous prime is 2157149651. The next prime is 2157149707. The reversal of 2157149705 is 5079417512.

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 2157149705 - 2⁶ = 2157149641 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2157149707) by changing a digit.

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, 11353325 + ... + 11353514.

It is an arithmetic number, because the mean of its divisors is an integer number (340602600).

Almost surely, 2^2157149705 is an apocalyptic number.

It is an amenable number.

2157149705 is a deficient number, since it is larger than the sum of its proper divisors (567671095).

2157149705 is a wasteful number, since it uses less digits than its factorization.

2157149705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22706863.

The product of its (nonzero) digits is 88200, while the sum is 41.

The square root of 2157149705 is about 46445.1257399525. The cubic root of 2157149705 is about 1292.0919735108.

The spelling of 2157149705 in words is "two billion, one hundred fifty-seven million, one hundred forty-nine thousand, seven hundred five".