1349550809 has 4 divisors (see below), whose sum is σ = 1378264704. Its totient is φ = 1320836916.

The previous prime is 1349550803. The next prime is 1349550821. The reversal of 1349550809 is 9080559431.

It is a happy number.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1349550809 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1349550809.

It is not an unprimeable number, because it can be changed into a prime (1349550803) 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, 14356877 + ... + 14356970.

It is an arithmetic number, because the mean of its divisors is an integer number (344566176).

Almost surely, 2^1349550809 is an apocalyptic number.

It is an amenable number.

1349550809 is a deficient number, since it is larger than the sum of its proper divisors (28713895).

1349550809 is an equidigital number, since it uses as much as digits as its factorization.

1349550809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28713894.

The product of its (nonzero) digits is 194400, while the sum is 44.

The square root of 1349550809 is about 36736.2329179245. The cubic root of 1349550809 is about 1105.0868557131.

The spelling of 1349550809 in words is "one billion, three hundred forty-nine million, five hundred fifty thousand, eight hundred nine".