3161540561 has 4 divisors (see below), whose sum is σ = 3161903412. Its totient is φ = 3161177712.

The previous prime is 3161540539. The next prime is 3161540713. The reversal of 3161540561 is 1650451613.

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 451817536 + 2709723025 = 21256^2 + 52055^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3161540561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3161545561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 168026 + ... + 185891.

It is an arithmetic number, because the mean of its divisors is an integer number (790475853).

Almost surely, 2^3161540561 is an apocalyptic number.

It is an amenable number.

3161540561 is a deficient number, since it is larger than the sum of its proper divisors (362851).

3161540561 is an equidigital number, since it uses as much as digits as its factorization.

3161540561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 362850.

The product of its (nonzero) digits is 10800, while the sum is 32.

The square root of 3161540561 is about 56227.5782957082. The cubic root of 3161540561 is about 1467.6852150511.

The spelling of 3161540561 in words is "three billion, one hundred sixty-one million, five hundred forty thousand, five hundred sixty-one".