1216236253 has 8 divisors (see below), whose sum is σ = 1289253888. Its totient is φ = 1143382464.

The previous prime is 1216236247. The next prime is 1216236271. The reversal of 1216236253 is 3526326121.

It is a happy number.

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

It is a de Polignac number, because none of the positive numbers 2^k-1216236253 is a prime.

It is a super-2 number, since 2×1216236253² = 2958461246222960018, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1216236223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25501 + ... + 55522.

It is an arithmetic number, because the mean of its divisors is an integer number (161156736).

Almost surely, 2^1216236253 is an apocalyptic number.

It is an amenable number.

1216236253 is a deficient number, since it is larger than the sum of its proper divisors (73017635).

1216236253 is an equidigital number, since it uses as much as digits as its factorization.

1216236253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81923.

The product of its digits is 12960, while the sum is 31.

The square root of 1216236253 is about 34874.5788935150. The cubic root of 1216236253 is about 1067.4297797817.

The spelling of 1216236253 in words is "one billion, two hundred sixteen million, two hundred thirty-six thousand, two hundred fifty-three".