2561322401 has 8 divisors (see below), whose sum is σ = 2794556064. Its totient is φ = 2328153120.

The previous prime is 2561322397. The next prime is 2561322469. The reversal of 2561322401 is 1042231652.

It is a happy number.

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 2561322401 - 2² = 2561322397 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2561322301) 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, 110261 + ... + 131453.

It is an arithmetic number, because the mean of its divisors is an integer number (349319508).

Almost surely, 2^2561322401 is an apocalyptic number.

It is an amenable number.

2561322401 is a deficient number, since it is larger than the sum of its proper divisors (233233663).

2561322401 is a wasteful number, since it uses less digits than its factorization.

2561322401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32191.

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 2561322401 is about 50609.5089978158. The cubic root of 2561322401 is about 1368.2162661591.

The spelling of 2561322401 in words is "two billion, five hundred sixty-one million, three hundred twenty-two thousand, four hundred one".