2561198447 has 6 divisors (see below), whose sum is σ = 2610437592. Its totient is φ = 2512871192.

The previous prime is 2561198377. The next prime is 2561198483. The reversal of 2561198447 is 7448911652.

It is a happy number.

2561198447 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 2561198447 - 2¹² = 2561194351 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2561198047) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 453083 + ... + 458700.

It is an arithmetic number, because the mean of its divisors is an integer number (435072932).

Almost surely, 2^2561198447 is an apocalyptic number.

2561198447 is a deficient number, since it is larger than the sum of its proper divisors (49239145).

2561198447 is an frugal number, since it uses more digits than its factorization.

2561198447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 911889 (or 911836 counting only the distinct ones).

The product of its digits is 483840, while the sum is 47.

The square root of 2561198447 is about 50608.2843712371. The cubic root of 2561198447 is about 1368.1941944075.

The spelling of 2561198447 in words is "two billion, five hundred sixty-one million, one hundred ninety-eight thousand, four hundred forty-seven".