1645132439 has 2 divisors, whose sum is σ = 1645132440. Its totient is φ = 1645132438.

The previous prime is 1645132373. The next prime is 1645132441. The reversal of 1645132439 is 9342315461.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1645132439 is a prime.

Together with 1645132441, 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 (1645132939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 822566219 + 822566220.

It is an arithmetic number, because the mean of its divisors is an integer number (822566220).

Almost surely, 2^1645132439 is an apocalyptic number.

1645132439 is a deficient number, since it is larger than the sum of its proper divisors (1).

1645132439 is an equidigital number, since it uses as much as digits as its factorization.

1645132439 is an evil number, because the sum of its binary digits is even.

The product of its digits is 77760, while the sum is 38.

The square root of 1645132439 is about 40560.2322355284. The cubic root of 1645132439 is about 1180.5026200741.

The spelling of 1645132439 in words is "one billion, six hundred forty-five million, one hundred thirty-two thousand, four hundred thirty-nine".