1023089909 has 4 divisors (see below), whose sum is σ = 1032143916. Its totient is φ = 1014035904.

The previous prime is 1023089891. The next prime is 1023089911. The reversal of 1023089909 is 9099803201.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 153016900 + 870073009 = 12370^2 + 29497^2 .

It is a cyclic number.

It is not a de Polignac number, because 1023089909 - 2²⁴ = 1006312693 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 (1023089959) 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, 4526834 + ... + 4527059.

It is an arithmetic number, because the mean of its divisors is an integer number (258035979).

Almost surely, 2^1023089909 is an apocalyptic number.

It is an amenable number.

1023089909 is a deficient number, since it is larger than the sum of its proper divisors (9054007).

1023089909 is an equidigital number, since it uses as much as digits as its factorization.

1023089909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9054006.

The product of its (nonzero) digits is 34992, while the sum is 41.

The square root of 1023089909 is about 31985.7766671375. The cubic root of 1023089909 is about 1007.6381465114.

The spelling of 1023089909 in words is "one billion, twenty-three million, eighty-nine thousand, nine hundred nine".