1645210459 has 2 divisors, whose sum is σ = 1645210460. Its totient is φ = 1645210458.

The previous prime is 1645210453. The next prime is 1645210507. The reversal of 1645210459 is 9540125461.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1645210459 is a prime.

It is not a weakly prime, because it can be changed into another prime (1645210453) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 822605229 + 822605230.

It is an arithmetic number, because the mean of its divisors is an integer number (822605230).

Almost surely, 2^1645210459 is an apocalyptic number.

1645210459 is a deficient number, since it is larger than the sum of its proper divisors (1).

1645210459 is an equidigital number, since it uses as much as digits as its factorization.

1645210459 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 43200, while the sum is 37.

The square root of 1645210459 is about 40561.1940036286. The cubic root of 1645210459 is about 1180.5212814610.

The spelling of 1645210459 in words is "one billion, six hundred forty-five million, two hundred ten thousand, four hundred fifty-nine".