1065947909 has 4 divisors (see below), whose sum is σ = 1147943916. Its totient is φ = 983951904.

The previous prime is 1065947893. The next prime is 1065947933. The reversal of 1065947909 is 9097495601.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9097495601 = 23 ⋅395543287.

It can be written as a sum of positive squares in 2 ways, for example, as 633931684 + 432016225 = 25178^2 + 20785^2 .

It is not a de Polignac number, because 1065947909 - 2⁴ = 1065947893 is a prime.

It is a super-2 number, since 2×1065947909² = 2272489889402944562, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1065947959) 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, 40997984 + ... + 40998009.

It is an arithmetic number, because the mean of its divisors is an integer number (286985979).

Almost surely, 2^1065947909 is an apocalyptic number.

It is an amenable number.

1065947909 is a deficient number, since it is larger than the sum of its proper divisors (81996007).

1065947909 is an equidigital number, since it uses as much as digits as its factorization.

1065947909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81996006.

The product of its (nonzero) digits is 612360, while the sum is 50.

The square root of 1065947909 is about 32648.8576982411. The cubic root of 1065947909 is about 1021.5163621331.

The spelling of 1065947909 in words is "one billion, sixty-five million, nine hundred forty-seven thousand, nine hundred nine".