2145289 has 2 divisors, whose sum is σ = 2145290. Its totient is φ = 2145288.

The previous prime is 2145287. The next prime is 2145307. The reversal of 2145289 is 9825412.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2131600 + 13689 = 1460^2 + 117^2 .

It is a cyclic number.

It is not a de Polignac number, because 2145289 - 2¹ = 2145287 is a prime.

Together with 2145287, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 2145289.

It is not a weakly prime, because it can be changed into another prime (2145287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1072644 + 1072645.

It is an arithmetic number, because the mean of its divisors is an integer number (1072645).

2^2145289 is an apocalyptic number.

It is an amenable number.

2145289 is a deficient number, since it is larger than the sum of its proper divisors (1).

2145289 is an equidigital number, since it uses as much as digits as its factorization.

2145289 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5760, while the sum is 31.

The square root of 2145289 is about 1464.6805112379. The cubic root of 2145289 is about 128.9719507150.

The spelling of 2145289 in words is "two million, one hundred forty-five thousand, two hundred eighty-nine".