645292019 has 2 divisors, whose sum is σ = 645292020. Its totient is φ = 645292018.

The previous prime is 645291991. The next prime is 645292033. The reversal of 645292019 is 910292546.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-645292019 is a prime.

It is a super-2 number, since 2×645292019² = 832803579570192722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (645295019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322646009 + 322646010.

It is an arithmetic number, because the mean of its divisors is an integer number (322646010).

Almost surely, 2^645292019 is an apocalyptic number.

645292019 is a deficient number, since it is larger than the sum of its proper divisors (1).

645292019 is an equidigital number, since it uses as much as digits as its factorization.

645292019 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 38.

The square root of 645292019 is about 25402.5986662782. The cubic root of 645292019 is about 864.1426318274.

The spelling of 645292019 in words is "six hundred forty-five million, two hundred ninety-two thousand, nineteen".