2561024311 has 4 divisors (see below), whose sum is σ = 2561713000. Its totient is φ = 2560335624.

The previous prime is 2561024303. The next prime is 2561024327. The reversal of 2561024311 is 1134201652.

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 2561024311 - 2³ = 2561024303 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 (2561022311) 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, 338736 + ... + 346213.

It is an arithmetic number, because the mean of its divisors is an integer number (640428250).

Almost surely, 2^2561024311 is an apocalyptic number.

2561024311 is a deficient number, since it is larger than the sum of its proper divisors (688689).

2561024311 is an equidigital number, since it uses as much as digits as its factorization.

2561024311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 688688.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 2561024311 is about 50606.5639122041. The cubic root of 2561024311 is about 1368.1631858427.

Adding to 2561024311 its reverse (1134201652), we get a palindrome (3695225963).

The spelling of 2561024311 in words is "two billion, five hundred sixty-one million, twenty-four thousand, three hundred eleven".