503305645 has 4 divisors (see below), whose sum is σ = 603966780. Its totient is φ = 402644512.

The previous prime is 503305633. The next prime is 503305651. The reversal of 503305645 is 546503305.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 210656196 + 292649449 = 14514^2 + 17107^2 .

It is a cyclic number.

It is not a de Polignac number, because 503305645 - 2⁹ = 503305133 is a prime.

It is a super-3 number, since 3×503305645³ (a number of 27 digits) contains 333 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50330560 + ... + 50330569.

It is an arithmetic number, because the mean of its divisors is an integer number (150991695).

Almost surely, 2^503305645 is an apocalyptic number.

It is an amenable number.

503305645 is a deficient number, since it is larger than the sum of its proper divisors (100661135).

503305645 is a wasteful number, since it uses less digits than its factorization.

503305645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100661134.

The product of its (nonzero) digits is 27000, while the sum is 31.

The square root of 503305645 is about 22434.4744756814. The cubic root of 503305645 is about 795.4458135323.

The spelling of 503305645 in words is "five hundred three million, three hundred five thousand, six hundred forty-five".