2145202405 has 8 divisors (see below), whose sum is σ = 2576984184. Its totient is φ = 1714334400.

The previous prime is 2145202399. The next prime is 2145202441. The reversal of 2145202405 is 5042025412.

It can be written as a sum of positive squares in 4 ways, for example, as 105144516 + 2040057889 = 10254^2 + 45167^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2145202405 - 2⁹ = 2145201893 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2145202405.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 223266 + ... + 232675.

It is an arithmetic number, because the mean of its divisors is an integer number (322123023).

Almost surely, 2^2145202405 is an apocalyptic number.

It is an amenable number.

2145202405 is a deficient number, since it is larger than the sum of its proper divisors (431781779).

2145202405 is an equidigital number, since it uses as much as digits as its factorization.

2145202405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 456887.

The product of its (nonzero) digits is 3200, while the sum is 25.

The square root of 2145202405 is about 46316.3297876678. The cubic root of 2145202405 is about 1289.7021536585.

Adding to 2145202405 its reverse (5042025412), we get a palindrome (7187227817).

The spelling of 2145202405 in words is "two billion, one hundred forty-five million, two hundred two thousand, four hundred five".