1216909253 has 8 divisors (see below), whose sum is σ = 1394957760. Its totient is φ = 1039911840.

The previous prime is 1216909237. The next prime is 1216909261. The reversal of 1216909253 is 3529096121.

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

It is a cyclic number.

It is not a de Polignac number, because 1216909253 - 2⁴ = 1216909237 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1216909273) 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 7 ways as a sum of consecutive naturals, for example, 260288 + ... + 264921.

It is an arithmetic number, because the mean of its divisors is an integer number (174369720).

Almost surely, 2^1216909253 is an apocalyptic number.

It is an amenable number.

1216909253 is a deficient number, since it is larger than the sum of its proper divisors (178048507).

1216909253 is an equidigital number, since it uses as much as digits as its factorization.

1216909253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 525547.

The product of its (nonzero) digits is 29160, while the sum is 38.

The square root of 1216909253 is about 34884.2264211205. The cubic root of 1216909253 is about 1067.6266296334.

The spelling of 1216909253 in words is "one billion, two hundred sixteen million, nine hundred nine thousand, two hundred fifty-three".