2545209399 has 16 divisors (see below), whose sum is σ = 3507784704. Its totient is φ = 1639867200.

The previous prime is 2545209397. The next prime is 2545209421. The reversal of 2545209399 is 9939025452.

It is a happy number.

It is not a de Polignac number, because 2545209399 - 2¹ = 2545209397 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2545209397) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 52792 + ... + 88754.

It is an arithmetic number, because the mean of its divisors is an integer number (219236544).

Almost surely, 2^2545209399 is an apocalyptic number.

2545209399 is a deficient number, since it is larger than the sum of its proper divisors (962575305).

2545209399 is a wasteful number, since it uses less digits than its factorization.

2545209399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36758.

The product of its (nonzero) digits is 874800, while the sum is 48.

The square root of 2545209399 is about 50450.0683745820. The cubic root of 2545209399 is about 1365.3411284969.

The spelling of 2545209399 in words is "two billion, five hundred forty-five million, two hundred nine thousand, three hundred ninety-nine".