1061243609 has 4 divisors (see below), whose sum is σ = 1061337060. Its totient is φ = 1061150160.

The previous prime is 1061243591. The next prime is 1061243639. The reversal of 1061243609 is 9063421601.

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: 9063421601 = 13 ⋅697186277.

It can be written as a sum of positive squares in 2 ways, for example, as 887742025 + 173501584 = 29795^2 + 13172^2 .

It is a cyclic number.

It is not a de Polignac number, because 1061243609 - 2²⁰ = 1060195033 is a prime.

It is a super-2 number, since 2×1061243609² = 2252475995286689762, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1061243639) 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, 26882 + ... + 53339.

It is an arithmetic number, because the mean of its divisors is an integer number (265334265).

Almost surely, 2^1061243609 is an apocalyptic number.

It is an amenable number.

1061243609 is a deficient number, since it is larger than the sum of its proper divisors (93451).

1061243609 is an equidigital number, since it uses as much as digits as its factorization.

1061243609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93450.

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 1061243609 is about 32576.7341671936. The cubic root of 1061243609 is about 1020.0114086254.

The spelling of 1061243609 in words is "one billion, sixty-one million, two hundred forty-three thousand, six hundred nine".