1212881513481 has 81 divisors (see below), whose sum is σ = 2014440106861. Its totient is φ = 702635142000.

The previous prime is 1212881513479. The next prime is 1212881513507. The reversal of 1212881513481 is 1843151882121.

The square root of 1212881513481 is 1101309.

It is a perfect power (a square), and thus also a powerful number.

1212881513481 is a `hidden beast` number, since 1 + 2 + 12 + 8 + 8 + 151 + 3 + 481 = 666.

It is not a de Polignac number, because 1212881513481 - 2¹ = 1212881513479 is a prime.

It is a super-2 number, since 2×1212881513481² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1212881513981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 835892806 + ... + 835894256.

Almost surely, 2^{1212881513481} is an apocalyptic number.

1212881513481 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1212881513481 is the 1101309-th square number.

1212881513481 is the 550655-th centered octagonal number.

It is an amenable number.

1212881513481 is a deficient number, since it is larger than the sum of its proper divisors (801558593380).

1212881513481 is an equidigital number, since it uses as much as digits as its factorization.

1212881513481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2976 (or 1488 counting only the distinct ones).

The product of its digits is 122880, while the sum is 45.

The spelling of 1212881513481 in words is "one trillion, two hundred twelve billion, eight hundred eighty-one million, five hundred thirteen thousand, four hundred eighty-one".