1445639189 has 2 divisors, whose sum is σ = 1445639190. Its totient is φ = 1445639188.

The previous prime is 1445639161. The next prime is 1445639191. The reversal of 1445639189 is 9819365441.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1385700625 + 59938564 = 37225^2 + 7742^2 .

It is a cyclic number.

It is not a de Polignac number, because 1445639189 - 2¹⁶ = 1445573653 is a prime.

Together with 1445639191, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1445639989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 722819594 + 722819595.

It is an arithmetic number, because the mean of its divisors is an integer number (722819595).

Almost surely, 2^1445639189 is an apocalyptic number.

It is an amenable number.

1445639189 is a deficient number, since it is larger than the sum of its proper divisors (1).

1445639189 is an equidigital number, since it uses as much as digits as its factorization.

1445639189 is an evil number, because the sum of its binary digits is even.

The product of its digits is 933120, while the sum is 50.

The square root of 1445639189 is about 38021.5621588593. The cubic root of 1445639189 is about 1130.7153924030.

The spelling of 1445639189 in words is "one billion, four hundred forty-five million, six hundred thirty-nine thousand, one hundred eighty-nine".