1216696100 has 18 divisors (see below), whose sum is σ = 2640230754. Its totient is φ = 486678400.

The previous prime is 1216696009. The next prime is 1216696121. The reversal of 1216696100 is 16966121.

It can be written as a sum of positive squares in 3 ways, for example, as 44729344 + 1171966756 = 6688^2 + 34234^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6083381 + ... + 6083580.

Almost surely, 2^1216696100 is an apocalyptic number.

1216696100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1216696100 is an abundant number, since it is smaller than the sum of its proper divisors (1423534654).

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

1216696100 is a wasteful number, since it uses less digits than its factorization.

1216696100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12166975 (or 12166968 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 32.

The square root of 1216696100 is about 34881.1711385957. The cubic root of 1216696100 is about 1067.5642910746.

The spelling of 1216696100 in words is "one billion, two hundred sixteen million, six hundred ninety-six thousand, one hundred".