2745743621 has 2 divisors, whose sum is σ = 2745743622. Its totient is φ = 2745743620.

The previous prime is 2745743597. The next prime is 2745743647. The reversal of 2745743621 is 1263475472.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2717536900 + 28206721 = 52130^2 + 5311^2 .

It is a cyclic number.

It is not a de Polignac number, because 2745743621 - 2⁶ = 2745743557 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2745745621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1372871810 + 1372871811.

It is an arithmetic number, because the mean of its divisors is an integer number (1372871811).

Almost surely, 2^2745743621 is an apocalyptic number.

It is an amenable number.

2745743621 is a deficient number, since it is larger than the sum of its proper divisors (1).

2745743621 is an equidigital number, since it uses as much as digits as its factorization.

2745743621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 282240, while the sum is 41.

The square root of 2745743621 is about 52399.8437115990. The cubic root of 2745743621 is about 1400.2964713969.

The spelling of 2745743621 in words is "two billion, seven hundred forty-five million, seven hundred forty-three thousand, six hundred twenty-one".