645848461 has 2 divisors, whose sum is σ = 645848462. Its totient is φ = 645848460.

The previous prime is 645848417. The next prime is 645848477. The reversal of 645848461 is 164848546.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 610386436 + 35462025 = 24706^2 + 5955^2 .

It is a cyclic number.

It is not a de Polignac number, because 645848461 - 2¹⁵ = 645815693 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (645858461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322924230 + 322924231.

It is an arithmetic number, because the mean of its divisors is an integer number (322924231).

Almost surely, 2^645848461 is an apocalyptic number.

It is an amenable number.

645848461 is a deficient number, since it is larger than the sum of its proper divisors (1).

645848461 is an equidigital number, since it uses as much as digits as its factorization.

645848461 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 737280, while the sum is 46.

The square root of 645848461 is about 25413.5487683243. The cubic root of 645848461 is about 864.3909468505.

The spelling of 645848461 in words is "six hundred forty-five million, eight hundred forty-eight thousand, four hundred sixty-one".