2145497409 has 16 divisors (see below), whose sum is σ = 3467471040. Its totient is φ = 1300301280.

The previous prime is 2145497381. The next prime is 2145497441. The reversal of 2145497409 is 9047945412.

It is not a de Polignac number, because 2145497409 - 2⁸ = 2145497153 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2145497479) 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, 3611652 + ... + 3612245.

It is an arithmetic number, because the mean of its divisors is an integer number (216716940).

Almost surely, 2^2145497409 is an apocalyptic number.

It is an amenable number.

2145497409 is a deficient number, since it is larger than the sum of its proper divisors (1321973631).

2145497409 is a wasteful number, since it uses less digits than its factorization.

2145497409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7223917 (or 7223911 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 45.

The square root of 2145497409 is about 46319.5143433089. The cubic root of 2145497409 is about 1289.7612700468.

The spelling of 2145497409 in words is "two billion, one hundred forty-five million, four hundred ninety-seven thousand, four hundred nine".