1645041187 has 2 divisors, whose sum is σ = 1645041188. Its totient is φ = 1645041186.

The previous prime is 1645041179. The next prime is 1645041217. The reversal of 1645041187 is 7811405461.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1645041187 - 2³ = 1645041179 is a prime.

It is not a weakly prime, because it can be changed into another prime (1645041887) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 822520593 + 822520594.

It is an arithmetic number, because the mean of its divisors is an integer number (822520594).

Almost surely, 2^1645041187 is an apocalyptic number.

1645041187 is a deficient number, since it is larger than the sum of its proper divisors (1).

1645041187 is an equidigital number, since it uses as much as digits as its factorization.

1645041187 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 26880, while the sum is 37.

The square root of 1645041187 is about 40559.1073249893. The cubic root of 1645041187 is about 1180.4807930134.

The spelling of 1645041187 in words is "one billion, six hundred forty-five million, forty-one thousand, one hundred eighty-seven".