1989612245 has 4 divisors (see below), whose sum is σ = 2387534700. Its totient is φ = 1591689792.

The previous prime is 1989612239. The next prime is 1989612253. The reversal of 1989612245 is 5422169891.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 580135396 + 1409476849 = 24086^2 + 37543^2 .

It is a cyclic number.

It is not a de Polignac number, because 1989612245 - 2⁶ = 1989612181 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1989612245.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 198961220 + ... + 198961229.

It is an arithmetic number, because the mean of its divisors is an integer number (596883675).

Almost surely, 2^1989612245 is an apocalyptic number.

It is an amenable number.

1989612245 is a deficient number, since it is larger than the sum of its proper divisors (397922455).

1989612245 is an equidigital number, since it uses as much as digits as its factorization.

1989612245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 397922454.

The product of its digits is 311040, while the sum is 47.

The square root of 1989612245 is about 44605.0697230707. The cubic root of 1989612245 is about 1257.7359706416.

The spelling of 1989612245 in words is "one billion, nine hundred eighty-nine million, six hundred twelve thousand, two hundred forty-five".