1020509 has 8 divisors (see below), whose sum is σ = 1227840. Its totient is φ = 828576.

The previous prime is 1020491. The next prime is 1020517. The reversal of 1020509 is 9050201.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1020509 - 2¹⁶ = 954973 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 (1020529) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3704 + ... + 3969.

It is an arithmetic number, because the mean of its divisors is an integer number (153480).

2^1020509 is an apocalyptic number.

1020509 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

1020509 is a deficient number, since it is larger than the sum of its proper divisors (207331).

1020509 is an equidigital number, since it uses as much as digits as its factorization.

1020509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7699.

The product of its (nonzero) digits is 90, while the sum is 17.

The square root of 1020509 is about 1010.2024549564. The cubic root of 1020509 is about 100.6790123206.

The spelling of 1020509 in words is "one million, twenty thousand, five hundred nine".