2745520409 has 4 divisors (see below), whose sum is σ = 2751718416. Its totient is φ = 2739322404.

The previous prime is 2745520381. The next prime is 2745520447. The reversal of 2745520409 is 9040255472.

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 not a de Polignac number, because 2745520409 - 2⁸ = 2745520153 is a prime.

It is a super-3 number, since 3×2745520409³ (a number of 29 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2745520489) 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, 3098339 + ... + 3099224.

It is an arithmetic number, because the mean of its divisors is an integer number (687929604).

Almost surely, 2^2745520409 is an apocalyptic number.

It is an amenable number.

2745520409 is a deficient number, since it is larger than the sum of its proper divisors (6198007).

2745520409 is an equidigital number, since it uses as much as digits as its factorization.

2745520409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6198006.

The product of its (nonzero) digits is 100800, while the sum is 38.

The square root of 2745520409 is about 52397.7137764617. The cubic root of 2745520409 is about 1400.2585252168.

The spelling of 2745520409 in words is "two billion, seven hundred forty-five million, five hundred twenty thousand, four hundred nine".