1216551324 has 48 divisors (see below), whose sum is σ = 2877638400. Its totient is φ = 399966336.

The previous prime is 1216551319. The next prime is 1216551341. The reversal of 1216551324 is 4231556121.

It is a junction number, because it is equal to n+sod(n) for n = 1216551291 and 1216551300.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 518947 + ... + 521285.

It is an arithmetic number, because the mean of its divisors is an integer number (59950800).

Almost surely, 2^1216551324 is an apocalyptic number.

It is an amenable number.

1216551324 is an abundant number, since it is smaller than the sum of its proper divisors (1661087076).

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

1216551324 is a wasteful number, since it uses less digits than its factorization.

1216551324 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2922 (or 2920 counting only the distinct ones).

The product of its digits is 7200, while the sum is 30.

The square root of 1216551324 is about 34879.0958025004. The cubic root of 1216551324 is about 1067.5219458474.

The spelling of 1216551324 in words is "one billion, two hundred sixteen million, five hundred fifty-one thousand, three hundred twenty-four".