2561213432 has 8 divisors (see below), whose sum is σ = 4802275200. Its totient is φ = 1280606712.

The previous prime is 2561213383. The next prime is 2561213437. The reversal of 2561213432 is 2343121652.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 2561213395 and 2561213404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2561213437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160075832 + ... + 160075847.

It is an arithmetic number, because the mean of its divisors is an integer number (600284400).

Almost surely, 2^2561213432 is an apocalyptic number.

It is an amenable number.

2561213432 is a deficient number, since it is larger than the sum of its proper divisors (2241061768).

2561213432 is a wasteful number, since it uses less digits than its factorization.

2561213432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 320151685 (or 320151681 counting only the distinct ones).

The product of its digits is 8640, while the sum is 29.

The square root of 2561213432 is about 50608.4324199041. The cubic root of 2561213432 is about 1368.1968627352.

The spelling of 2561213432 in words is "two billion, five hundred sixty-one million, two hundred thirteen thousand, four hundred thirty-two".