2156904571 has 4 divisors (see below), whose sum is σ = 2161297944. Its totient is φ = 2152511200.

The previous prime is 2156904569. The next prime is 2156904601. The reversal of 2156904571 is 1754096512.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2156904571 - 2¹ = 2156904569 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2156904371) 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, 2195950 + ... + 2196931.

It is an arithmetic number, because the mean of its divisors is an integer number (540324486).

Almost surely, 2^2156904571 is an apocalyptic number.

2156904571 is a deficient number, since it is larger than the sum of its proper divisors (4393373).

2156904571 is an equidigital number, since it uses as much as digits as its factorization.

2156904571 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4393372.

The product of its (nonzero) digits is 75600, while the sum is 40.

The square root of 2156904571 is about 46442.4867012954. The cubic root of 2156904571 is about 1292.0430281098.

The spelling of 2156904571 in words is "two billion, one hundred fifty-six million, nine hundred four thousand, five hundred seventy-one".