645411199 has 2 divisors, whose sum is σ = 645411200. Its totient is φ = 645411198.

The previous prime is 645411187. The next prime is 645411233. The reversal of 645411199 is 991114546.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 645411199 - 2¹¹ = 645409151 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (645411499) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322705599 + 322705600.

It is an arithmetic number, because the mean of its divisors is an integer number (322705600).

Almost surely, 2^645411199 is an apocalyptic number.

645411199 is a deficient number, since it is larger than the sum of its proper divisors (1).

645411199 is an equidigital number, since it uses as much as digits as its factorization.

645411199 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 38880, while the sum is 40.

The square root of 645411199 is about 25404.9443809665. The cubic root of 645411199 is about 864.1958285074.

The spelling of 645411199 in words is "six hundred forty-five million, four hundred eleven thousand, one hundred ninety-nine".