2152571857 has 4 divisors (see below), whose sum is σ = 2157709680. Its totient is φ = 2147434036.

The previous prime is 2152571821. The next prime is 2152571887. The reversal of 2152571857 is 7581752512.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2152571857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2152571887) 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 3 ways as a sum of consecutive naturals, for example, 2568283 + ... + 2569120.

It is an arithmetic number, because the mean of its divisors is an integer number (539427420).

Almost surely, 2^2152571857 is an apocalyptic number.

It is an amenable number.

2152571857 is a deficient number, since it is larger than the sum of its proper divisors (5137823).

2152571857 is an equidigital number, since it uses as much as digits as its factorization.

2152571857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5137822.

The product of its digits is 196000, while the sum is 43.

The square root of 2152571857 is about 46395.8172360397. The cubic root of 2152571857 is about 1291.1773113211.

It can be divided in two parts, 215 and 2571857, that multiplied together give a palindrome (552949255).

The spelling of 2152571857 in words is "two billion, one hundred fifty-two million, five hundred seventy-one thousand, eight hundred fifty-seven".