645093 has 12 divisors (see below), whose sum is σ = 938860. Its totient is φ = 426816.

The previous prime is 645091. The next prime is 645097. The reversal of 645093 is 390546.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 263169 + 381924 = 513^2 + 618^2 .

It is not a de Polignac number, because 645093 - 2¹ = 645091 is a prime.

It is a super-2 number, since 2×645093² = 832289957298, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1905 + ... + 2217.

2⁶⁴⁵⁰⁹³ is an apocalyptic number.

It is an amenable number.

645093 is a deficient number, since it is larger than the sum of its proper divisors (293767).

645093 is a wasteful number, since it uses less digits than its factorization.

645093 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 548 (or 545 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 27.

The square root of 645093 is about 803.1768173945. The cubic root of 645093 is about 86.4053783946.

The spelling of 645093 in words is "six hundred forty-five thousand, ninety-three".