2542745321 has 4 divisors (see below), whose sum is σ = 2543218944. Its totient is φ = 2542271700.

The previous prime is 2542745311. The next prime is 2542745327. The reversal of 2542745321 is 1235472452.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2542745321 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2542745327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 228665 + ... + 239526.

It is an arithmetic number, because the mean of its divisors is an integer number (635804736).

Almost surely, 2^2542745321 is an apocalyptic number.

It is an amenable number.

2542745321 is a deficient number, since it is larger than the sum of its proper divisors (473623).

2542745321 is an equidigital number, since it uses as much as digits as its factorization.

2542745321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 473622.

The product of its digits is 67200, while the sum is 35.

The square root of 2542745321 is about 50425.6415031083. The cubic root of 2542745321 is about 1364.9003797826.

The spelling of 2542745321 in words is "two billion, five hundred forty-two million, seven hundred forty-five thousand, three hundred twenty-one".