1020610809 has 27 divisors (see below), whose sum is σ = 1544434437. Its totient is φ = 649418616.

The previous prime is 1020610807. The next prime is 1020610819. The reversal of 1020610809 is 9080160201.

The square root of 1020610809 is 31947.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 1020610809 - 2¹ = 1020610807 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1020610807) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 2204112 + ... + 2204574.

Almost surely, 2^1020610809 is an apocalyptic number.

1020610809 is the 31947-th square number.

1020610809 is the 15974-th centered octagonal number.

It is an amenable number.

1020610809 is a deficient number, since it is larger than the sum of its proper divisors (523823628).

1020610809 is an frugal number, since it uses more digits than its factorization.

1020610809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 978 (or 489 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 27.

The cubic root of 1020610809 is about 1006.8236022137.

The spelling of 1020610809 in words is "one billion, twenty million, six hundred ten thousand, eight hundred nine".