1149449809 has 4 divisors (see below), whose sum is σ = 1150981120. Its totient is φ = 1147918500.

The previous prime is 1149449767. The next prime is 1149449827. The reversal of 1149449809 is 9089449411.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9089449411 = 7 ⋅1298492773.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1149449809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1149449839) 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, 764529 + ... + 766030.

It is an arithmetic number, because the mean of its divisors is an integer number (287745280).

Almost surely, 2^1149449809 is an apocalyptic number.

It is an amenable number.

1149449809 is a deficient number, since it is larger than the sum of its proper divisors (1531311).

1149449809 is an equidigital number, since it uses as much as digits as its factorization.

1149449809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1531310.

The product of its (nonzero) digits is 373248, while the sum is 49.

The square root of 1149449809 is about 33903.5368213996. The cubic root of 1149449809 is about 1047.5224455444.

The spelling of 1149449809 in words is "one billion, one hundred forty-nine million, four hundred forty-nine thousand, eight hundred nine".