1216905413 has 16 divisors (see below), whose sum is σ = 1289312640. Its totient is φ = 1146218304.

The previous prime is 1216905397. The next prime is 1216905427. The reversal of 1216905413 is 3145096121.

It is a cyclic number.

It is not a de Polignac number, because 1216905413 - 2⁴ = 1216905397 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1216905413.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1216905463) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 711203 + ... + 712911.

It is an arithmetic number, because the mean of its divisors is an integer number (80582040).

Almost surely, 2^1216905413 is an apocalyptic number.

It is an amenable number.

1216905413 is a deficient number, since it is larger than the sum of its proper divisors (72407227).

1216905413 is a wasteful number, since it uses less digits than its factorization.

1216905413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2188.

The product of its (nonzero) digits is 6480, while the sum is 32.

The square root of 1216905413 is about 34884.1713818746. The cubic root of 1216905413 is about 1067.6255066545.

The spelling of 1216905413 in words is "one billion, two hundred sixteen million, nine hundred five thousand, four hundred thirteen".