920509 has 2 divisors, whose sum is σ = 920510. Its totient is φ = 920508.

The previous prime is 920497. The next prime is 920519. The reversal of 920509 is 905029.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 648025 + 272484 = 805^2 + 522^2 .

It is a cyclic number.

It is not a de Polignac number, because 920509 - 2⁵ = 920477 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (920519) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 460254 + 460255.

It is an arithmetic number, because the mean of its divisors is an integer number (460255).

2⁹²⁰⁵⁰⁹ is an apocalyptic number.

It is an amenable number.

920509 is a deficient number, since it is larger than the sum of its proper divisors (1).

920509 is an equidigital number, since it uses as much as digits as its factorization.

920509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 810, while the sum is 25.

The square root of 920509 is about 959.4316025648. The cubic root of 920509 is about 97.2768158264.

The spelling of 920509 in words is "nine hundred twenty thousand, five hundred nine".