3156572161 has 4 divisors (see below), whose sum is σ = 3168306900. Its totient is φ = 3144837424.

The previous prime is 3156572149. The next prime is 3156572219. The reversal of 3156572161 is 1612756513.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1927649025 + 1228923136 = 43905^2 + 35056^2 .

It is a cyclic number.

It is not a de Polignac number, because 3156572161 - 2⁵ = 3156572129 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 3156572161.

It is not an unprimeable number, because it can be changed into a prime (3156572131) 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, 5866966 + ... + 5867503.

It is an arithmetic number, because the mean of its divisors is an integer number (792076725).

Almost surely, 2^3156572161 is an apocalyptic number.

It is an amenable number.

3156572161 is a deficient number, since it is larger than the sum of its proper divisors (11734739).

3156572161 is a wasteful number, since it uses less digits than its factorization.

3156572161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11734738.

The product of its digits is 37800, while the sum is 37.

The square root of 3156572161 is about 56183.3797577184. The cubic root of 3156572161 is about 1466.9159834832.

The spelling of 3156572161 in words is "three billion, one hundred fifty-six million, five hundred seventy-two thousand, one hundred sixty-one".