645034193 has 2 divisors, whose sum is σ = 645034194. Its totient is φ = 645034192.

The previous prime is 645034183. The next prime is 645034231. The reversal of 645034193 is 391430546.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 605996689 + 39037504 = 24617^2 + 6248^2 .

It is a cyclic number.

It is not a de Polignac number, because 645034193 - 2⁶ = 645034129 is a prime.

It is a super-2 number, since 2×645034193² = 832138220278322498, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (645034163) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322517096 + 322517097.

It is an arithmetic number, because the mean of its divisors is an integer number (322517097).

Almost surely, 2^645034193 is an apocalyptic number.

It is an amenable number.

645034193 is a deficient number, since it is larger than the sum of its proper divisors (1).

645034193 is an equidigital number, since it uses as much as digits as its factorization.

645034193 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 38880, while the sum is 35.

The square root of 645034193 is about 25397.5233635093. The cubic root of 645034193 is about 864.0275272901.

The spelling of 645034193 in words is "six hundred forty-five million, thirty-four thousand, one hundred ninety-three".