2106741561 has 4 divisors (see below), whose sum is σ = 2808988752. Its totient is φ = 1404494372.

The previous prime is 2106741551. The next prime is 2106741563. The reversal of 2106741561 is 1651476012.

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-2106741561 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2106741563) 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, 351123591 + ... + 351123596.

It is an arithmetic number, because the mean of its divisors is an integer number (702247188).

Almost surely, 2^2106741561 is an apocalyptic number.

It is an amenable number.

2106741561 is a deficient number, since it is larger than the sum of its proper divisors (702247191).

2106741561 is an equidigital number, since it uses as much as digits as its factorization.

2106741561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 702247190.

The product of its (nonzero) digits is 10080, while the sum is 33.

The square root of 2106741561 is about 45899.2544710696. The cubic root of 2106741561 is about 1281.9480349571.

The spelling of 2106741561 in words is "two billion, one hundred six million, seven hundred forty-one thousand, five hundred sixty-one".