2561801101 has 8 divisors (see below), whose sum is σ = 2653166880. Its totient is φ = 2470637232.

The previous prime is 2561801093. The next prime is 2561801147. The reversal of 2561801101 is 1011081652.

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 2561801101 - 2³ = 2561801093 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 (2561801161) 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, 24415 + ... + 75628.

It is an arithmetic number, because the mean of its divisors is an integer number (331645860).

Almost surely, 2^2561801101 is an apocalyptic number.

It is an amenable number.

2561801101 is a deficient number, since it is larger than the sum of its proper divisors (91365779).

2561801101 is a wasteful number, since it uses less digits than its factorization.

2561801101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100955.

The product of its (nonzero) digits is 480, while the sum is 25.

The square root of 2561801101 is about 50614.2381252548. The cubic root of 2561801101 is about 1368.3014987362.

Adding to 2561801101 its reverse (1011081652), we get a palindrome (3572882753).

The spelling of 2561801101 in words is "two billion, five hundred sixty-one million, eight hundred one thousand, one hundred one".