645090503 has 2 divisors, whose sum is σ = 645090504. Its totient is φ = 645090502.

The previous prime is 645090497. The next prime is 645090533. The reversal of 645090503 is 305090546.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 645090503 - 2²⁰ = 644041927 is a prime.

It is a super-2 number, since 2×645090503² = 832283514121586018, which contains 22 as substring.

It is equal to p_33551258 and since 645090503 and 33551258 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 645090503.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (645090533) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322545251 + 322545252.

It is an arithmetic number, because the mean of its divisors is an integer number (322545252).

Almost surely, 2^645090503 is an apocalyptic number.

645090503 is a deficient number, since it is larger than the sum of its proper divisors (1).

645090503 is an equidigital number, since it uses as much as digits as its factorization.

645090503 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16200, while the sum is 32.

The square root of 645090503 is about 25398.6319119751. The cubic root of 645090503 is about 864.0526690965.

The spelling of 645090503 in words is "six hundred forty-five million, ninety thousand, five hundred three".