645851183 has 2 divisors, whose sum is σ = 645851184. Its totient is φ = 645851182.

The previous prime is 645851119. The next prime is 645851191. The reversal of 645851183 is 381158546.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 645851183 - 2⁶ = 645851119 is a prime.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 645851183.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (645851383) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322925591 + 322925592.

It is an arithmetic number, because the mean of its divisors is an integer number (322925592).

Almost surely, 2^645851183 is an apocalyptic number.

645851183 is a deficient number, since it is larger than the sum of its proper divisors (1).

645851183 is an equidigital number, since it uses as much as digits as its factorization.

645851183 is an evil number, because the sum of its binary digits is even.

The product of its digits is 115200, while the sum is 41.

The square root of 645851183 is about 25413.6023223785. The cubic root of 645851183 is about 864.3921612060.

The spelling of 645851183 in words is "six hundred forty-five million, eight hundred fifty-one thousand, one hundred eighty-three".