2561204207 has 4 divisors (see below), whose sum is σ = 2711863296. Its totient is φ = 2410545120.

The previous prime is 2561204203. The next prime is 2561204213. The reversal of 2561204207 is 7024021652.

It is a happy number.

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 2561204207 - 2² = 2561204203 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2561204207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2561204203) 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, 75329519 + ... + 75329552.

It is an arithmetic number, because the mean of its divisors is an integer number (677965824).

Almost surely, 2^2561204207 is an apocalyptic number.

2561204207 is a deficient number, since it is larger than the sum of its proper divisors (150659089).

2561204207 is a wasteful number, since it uses less digits than its factorization.

2561204207 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150659088.

The product of its (nonzero) digits is 6720, while the sum is 29.

The square root of 2561204207 is about 50608.3412788841. The cubic root of 2561204207 is about 1368.1952200723.

Adding to 2561204207 its reverse (7024021652), we get a palindrome (9585225859).

The spelling of 2561204207 in words is "two billion, five hundred sixty-one million, two hundred four thousand, two hundred seven".