3561131273891 has 8 divisors (see below), whose sum is σ = 3719093647104. Its totient is φ = 3403429782280.

The previous prime is 3561131273851. The next prime is 3561131273897. The reversal of 3561131273891 is 1983721311653.

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 3561131273891 - 2¹⁴ = 3561131257507 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3561131273897) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 65192495 + ... + 65247096.

It is an arithmetic number, because the mean of its divisors is an integer number (464886705888).

Almost surely, 2^{3561131273891} is an apocalyptic number.

3561131273891 is a deficient number, since it is larger than the sum of its proper divisors (157962373213).

3561131273891 is a wasteful number, since it uses less digits than its factorization.

3561131273891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130440801.

The product of its digits is 816480, while the sum is 50.

The spelling of 3561131273891 in words is "three trillion, five hundred sixty-one billion, one hundred thirty-one million, two hundred seventy-three thousand, eight hundred ninety-one".