1012565503 has 4 divisors (see below), whose sum is σ = 1022028840. Its totient is φ = 1003102168.

The previous prime is 1012565497. The next prime is 1012565527. The reversal of 1012565503 is 3055652101.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3055652101 = 421 ⋅7258081.

It is a cyclic number.

It is not a de Polignac number, because 1012565503 - 2²¹ = 1010468351 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1012565563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4731508 + ... + 4731721.

It is an arithmetic number, because the mean of its divisors is an integer number (255507210).

Almost surely, 2^1012565503 is an apocalyptic number.

1012565503 is a deficient number, since it is larger than the sum of its proper divisors (9463337).

1012565503 is an equidigital number, since it uses as much as digits as its factorization.

1012565503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9463336.

The product of its (nonzero) digits is 4500, while the sum is 28.

The square root of 1012565503 is about 31820.8344170922. The cubic root of 1012565503 is about 1004.1710789114.

The spelling of 1012565503 in words is "one billion, twelve million, five hundred sixty-five thousand, five hundred three".