2561193619 has 4 divisors (see below), whose sum is σ = 2643812800. Its totient is φ = 2478574440.

The previous prime is 2561193577. The next prime is 2561193637. The reversal of 2561193619 is 9163911652.

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 2561193619 - 2¹¹ = 2561191571 is a prime.

It is a super-2 number, since 2×2561193619² = 13119425508012634322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2561193659) 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, 41309544 + ... + 41309605.

It is an arithmetic number, because the mean of its divisors is an integer number (660953200).

Almost surely, 2^2561193619 is an apocalyptic number.

2561193619 is a deficient number, since it is larger than the sum of its proper divisors (82619181).

2561193619 is an equidigital number, since it uses as much as digits as its factorization.

2561193619 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82619180.

The product of its digits is 87480, while the sum is 43.

The square root of 2561193619 is about 50608.2366715143. The cubic root of 2561193619 is about 1368.1933346999.

The spelling of 2561193619 in words is "two billion, five hundred sixty-one million, one hundred ninety-three thousand, six hundred nineteen".