2145243405 has 16 divisors (see below), whose sum is σ = 3433074624. Its totient is φ = 1143901440.

The previous prime is 2145243389. The next prime is 2145243421. The reversal of 2145243405 is 5043425412.

It is an interprime number because it is at equal distance from previous prime (2145243389) and next prime (2145243421).

It is not a de Polignac number, because 2145243405 - 2⁴ = 2145243389 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 86182 + ... + 108248.

It is an arithmetic number, because the mean of its divisors is an integer number (214567164).

Almost surely, 2^2145243405 is an apocalyptic number.

It is an amenable number.

2145243405 is a deficient number, since it is larger than the sum of its proper divisors (1287831219).

2145243405 is a wasteful number, since it uses less digits than its factorization.

2145243405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28556.

The product of its (nonzero) digits is 19200, while the sum is 30.

The square root of 2145243405 is about 46316.7723940259. The cubic root of 2145243405 is about 1289.7103700473.

Adding to 2145243405 its reverse (5043425412), we get a palindrome (7188668817).

The spelling of 2145243405 in words is "two billion, one hundred forty-five million, two hundred forty-three thousand, four hundred five".