10520509 has 16 divisors (see below), whose sum is σ = 11545600. Its totient is φ = 9552816.

The previous prime is 10520507. The next prime is 10520537. The reversal of 10520509 is 90502501.

10520509 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 10520509 - 2¹ = 10520507 is a prime.

It is a super-2 number, since 2×10520509² = 221362219238162, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 10520509.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10520507) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 64462 + ... + 64624.

It is an arithmetic number, because the mean of its divisors is an integer number (721600).

Almost surely, 2^10520509 is an apocalyptic number.

10520509 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

10520509 is a deficient number, since it is larger than the sum of its proper divisors (1025091).

10520509 is a wasteful number, since it uses less digits than its factorization.

10520509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 304.

The product of its (nonzero) digits is 450, while the sum is 22.

The square root of 10520509 is about 3243.5334128077. The cubic root of 10520509 is about 219.1184349972.

The spelling of 10520509 in words is "ten million, five hundred twenty thousand, five hundred nine".