1045693309 has 4 divisors (see below), whose sum is σ = 1045779004. Its totient is φ = 1045607616.

The previous prime is 1045693303. The next prime is 1045693349. The reversal of 1045693309 is 9033965401.

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: 9033965401 = 18199 ⋅496399.

It can be written as a sum of positive squares in 2 ways, for example, as 552720100 + 492973209 = 23510^2 + 22203^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1045693309 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 (1045693303) 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, 20742 + ... + 50215.

It is an arithmetic number, because the mean of its divisors is an integer number (261444751).

Almost surely, 2^1045693309 is an apocalyptic number.

It is an amenable number.

1045693309 is a deficient number, since it is larger than the sum of its proper divisors (85695).

1045693309 is an equidigital number, since it uses as much as digits as its factorization.

1045693309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85694.

The product of its (nonzero) digits is 87480, while the sum is 40.

The square root of 1045693309 is about 32337.1815252969. The cubic root of 1045693309 is about 1015.0048319312.

The spelling of 1045693309 in words is "one billion, forty-five million, six hundred ninety-three thousand, three hundred nine".