1213569216 has 294 divisors, whose sum is σ = 3906141540. Its totient is φ = 372874752.

The previous prime is 1213569211. The next prime is 1213569221. The reversal of 1213569216 is 6129653121.

It is an interprime number because it is at equal distance from previous prime (1213569211) and next prime (1213569221).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (1213569211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 41 ways as a sum of consecutive naturals, for example, 32799150 + ... + 32799186.

Almost surely, 2^1213569216 is an apocalyptic number.

1213569216 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1213569216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1953070770).

1213569216 is an abundant number, since it is smaller than the sum of its proper divisors (2692572324).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1213569216 is an frugal number, since it uses more digits than its factorization.

1213569216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123 (or 61 counting only the distinct ones).

The product of its digits is 19440, while the sum is 36.

The square root of 1213569216 is about 34836.3203567771. The cubic root of 1213569216 is about 1066.6489670674.

The spelling of 1213569216 in words is "one billion, two hundred thirteen million, five hundred sixty-nine thousand, two hundred sixteen".