2545345421 has 2 divisors, whose sum is σ = 2545345422. Its totient is φ = 2545345420.

The previous prime is 2545345409. The next prime is 2545345423. The reversal of 2545345421 is 1245435452.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1616924521 + 928420900 = 40211^2 + 30470^2 .

It is a cyclic number.

It is not a de Polignac number, because 2545345421 - 2³⁰ = 1471603597 is a prime.

Together with 2545345423, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2545345423) 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 as a sum of consecutive naturals, namely, 1272672710 + 1272672711.

It is an arithmetic number, because the mean of its divisors is an integer number (1272672711).

Almost surely, 2^2545345421 is an apocalyptic number.

It is an amenable number.

2545345421 is a deficient number, since it is larger than the sum of its proper divisors (1).

2545345421 is an equidigital number, since it uses as much as digits as its factorization.

2545345421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 96000, while the sum is 35.

The square root of 2545345421 is about 50451.4164419593. The cubic root of 2545345421 is about 1365.3654504148.

The spelling of 2545345421 in words is "two billion, five hundred forty-five million, three hundred forty-five thousand, four hundred twenty-one".