2145406579 has 4 divisors (see below), whose sum is σ = 2271606984. Its totient is φ = 2019206176.

The previous prime is 2145406559. The next prime is 2145406591. The reversal of 2145406579 is 9756045412.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2145406579 - 2⁵ = 2145406547 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2145406559) 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 in 3 ways as a sum of consecutive naturals, for example, 63100177 + ... + 63100210.

It is an arithmetic number, because the mean of its divisors is an integer number (567901746).

Almost surely, 2^2145406579 is an apocalyptic number.

2145406579 is a deficient number, since it is larger than the sum of its proper divisors (126200405).

2145406579 is a wasteful number, since it uses less digits than its factorization.

2145406579 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126200404.

The product of its (nonzero) digits is 302400, while the sum is 43.

The square root of 2145406579 is about 46318.5338606481. The cubic root of 2145406579 is about 1289.7430690352.

The spelling of 2145406579 in words is "two billion, one hundred forty-five million, four hundred six thousand, five hundred seventy-nine".