1166724509 has 4 divisors (see below), whose sum is σ = 1166859804. Its totient is φ = 1166589216.

The previous prime is 1166724499. The next prime is 1166724529. The reversal of 1166724509 is 9054276611.

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 112423609 + 1054300900 = 10603^2 + 32470^2 .

It is a cyclic number.

It is not a de Polignac number, because 1166724509 - 2⁸ = 1166724253 is a prime.

It is a super-2 number, since 2×1166724509² = 2722492159802582162, 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 (1166724529) 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, 53762 + ... + 72275.

It is an arithmetic number, because the mean of its divisors is an integer number (291714951).

Almost surely, 2^1166724509 is an apocalyptic number.

It is an amenable number.

1166724509 is a deficient number, since it is larger than the sum of its proper divisors (135295).

1166724509 is an equidigital number, since it uses as much as digits as its factorization.

1166724509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135294.

The product of its (nonzero) digits is 90720, while the sum is 41.

The square root of 1166724509 is about 34157.3492677637. The cubic root of 1166724509 is about 1052.7439970827.

The spelling of 1166724509 in words is "one billion, one hundred sixty-six million, seven hundred twenty-four thousand, five hundred nine".