1211316656 has 40 divisors (see below), whose sum is σ = 2629493904. Its totient is φ = 535714560.

The previous prime is 1211316649. The next prime is 1211316683. The reversal of 1211316656 is 6566131121.

It is a super-2 number, since 2×1211316656² = 2934576082206044672, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 86495 + ... + 99518.

Almost surely, 2^1211316656 is an apocalyptic number.

1211316656 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1211316656 is an abundant number, since it is smaller than the sum of its proper divisors (1418177248).

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

1211316656 is a wasteful number, since it uses less digits than its factorization.

1211316656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 186069 (or 186063 counting only the distinct ones).

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

The square root of 1211316656 is about 34803.9747155408. The cubic root of 1211316656 is about 1065.9886067350.

Adding to 1211316656 its reverse (6566131121), we get a palindrome (7777447777).

The spelling of 1211316656 in words is "one billion, two hundred eleven million, three hundred sixteen thousand, six hundred fifty-six".