1291153209 has 8 divisors (see below), whose sum is σ = 1730458272. Its totient is φ = 856308480.

The previous prime is 1291153187. The next prime is 1291153211. The reversal of 1291153209 is 9023511921.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1291153209 - 2⁵ = 1291153177 is a prime.

It is a super-2 number, since 2×1291153209² = 3334153218221995362, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1291153209.

It is not an unprimeable number, because it can be changed into a prime (1291153609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1114407 + ... + 1115564.

It is an arithmetic number, because the mean of its divisors is an integer number (216307284).

Almost surely, 2^1291153209 is an apocalyptic number.

It is an amenable number.

1291153209 is a deficient number, since it is larger than the sum of its proper divisors (439305063).

1291153209 is a wasteful number, since it uses less digits than its factorization.

1291153209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2230167.

The product of its (nonzero) digits is 4860, while the sum is 33.

The square root of 1291153209 is about 35932.6204026369. The cubic root of 1291153209 is about 1088.9115214884.

The spelling of 1291153209 in words is "one billion, two hundred ninety-one million, one hundred fifty-three thousand, two hundred nine".