1148220809 has 4 divisors (see below), whose sum is σ = 1187814660. Its totient is φ = 1108626960.

The previous prime is 1148220803. The next prime is 1148220833. The reversal of 1148220809 is 9080228411.

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 401401225 + 746819584 = 20035^2 + 27328^2 .

It is a cyclic number.

It is not a de Polignac number, because 1148220809 - 2⁴ = 1148220793 is a prime.

It is a super-2 number, since 2×1148220809² = 2636822052441228962, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1148220803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19796882 + ... + 19796939.

It is an arithmetic number, because the mean of its divisors is an integer number (296953665).

Almost surely, 2^1148220809 is an apocalyptic number.

It is an amenable number.

1148220809 is a deficient number, since it is larger than the sum of its proper divisors (39593851).

1148220809 is an equidigital number, since it uses as much as digits as its factorization.

1148220809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39593850.

The product of its (nonzero) digits is 9216, while the sum is 35.

The square root of 1148220809 is about 33885.4070213123. The cubic root of 1148220809 is about 1047.1489728962.

The spelling of 1148220809 in words is "one billion, one hundred forty-eight million, two hundred twenty thousand, eight hundred nine".