1216303612 has 6 divisors (see below), whose sum is σ = 2128531328. Its totient is φ = 608151804.

The previous prime is 1216303609. The next prime is 1216303657. The reversal of 1216303612 is 2163036121.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 152037948 + ... + 152037955.

Almost surely, 2^1216303612 is an apocalyptic number.

It is an amenable number.

1216303612 is a deficient number, since it is larger than the sum of its proper divisors (912227716).

1216303612 is a wasteful number, since it uses less digits than its factorization.

1216303612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 304075907 (or 304075905 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 1216303612 is about 34875.5446122351. The cubic root of 1216303612 is about 1067.4494852940.

Adding to 1216303612 its reverse (2163036121), we get a palindrome (3379339733).

The spelling of 1216303612 in words is "one billion, two hundred sixteen million, three hundred three thousand, six hundred twelve".