1011020489 has 4 divisors (see below), whose sum is σ = 1011084180. Its totient is φ = 1010956800.

The previous prime is 1011020473. The next prime is 1011020501. The reversal of 1011020489 is 9840201101.

1011020489 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 9840201101 = 15881 ⋅619621.

It can be written as a sum of positive squares in 2 ways, for example, as 176677264 + 834343225 = 13292^2 + 28885^2 .

It is a cyclic number.

It is not a de Polignac number, because 1011020489 - 2⁴ = 1011020473 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1011020089) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13289 + ... + 46889.

It is an arithmetic number, because the mean of its divisors is an integer number (252771045).

Almost surely, 2^1011020489 is an apocalyptic number.

It is an amenable number.

1011020489 is a deficient number, since it is larger than the sum of its proper divisors (63691).

1011020489 is an equidigital number, since it uses as much as digits as its factorization.

1011020489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63690.

The product of its (nonzero) digits is 576, while the sum is 26.

The square root of 1011020489 is about 31796.5483818606. The cubic root of 1011020489 is about 1003.6600837763.

The spelling of 1011020489 in words is "one billion, eleven million, twenty thousand, four hundred eighty-nine".