645199201 has 2 divisors, whose sum is σ = 645199202. Its totient is φ = 645199200.

The previous prime is 645199183. The next prime is 645199267. The reversal of 645199201 is 102991546.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 645109201 + 90000 = 25399^2 + 300^2 .

It is a cyclic number.

It is not a de Polignac number, because 645199201 - 2¹⁵ = 645166433 is a prime.

It is not a weakly prime, because it can be changed into another prime (645199301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322599600 + 322599601.

It is an arithmetic number, because the mean of its divisors is an integer number (322599601).

Almost surely, 2^645199201 is an apocalyptic number.

It is an amenable number.

645199201 is a deficient number, since it is larger than the sum of its proper divisors (1).

645199201 is an equidigital number, since it uses as much as digits as its factorization.

645199201 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 19440, while the sum is 37.

The square root of 645199201 is about 25400.7716615067. The cubic root of 645199201 is about 864.1011974409.

The spelling of 645199201 in words is "six hundred forty-five million, one hundred ninety-nine thousand, two hundred one".