1261113987852 has 120 divisors (see below), whose sum is σ = 3523355844624. Its totient is φ = 391945817088.

The previous prime is 1261113987841. The next prime is 1261113987857. The reversal of 1261113987852 is 2587893111621.

1261113987852 is a `hidden beast` number, since 1 + 2 + 611 + 13 + 9 + 8 + 7 + 8 + 5 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (1261113987857) by changing a digit.

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 39 ways as a sum of consecutive naturals, for example, 480553 + ... + 1659264.

Almost surely, 2^{1261113987852} is an apocalyptic number.

1261113987852 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1261113987852 is an abundant number, since it is smaller than the sum of its proper divisors (2262241856772).

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

1261113987852 is a wasteful number, since it uses less digits than its factorization.

1261113987852 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2139957 (or 2139946 counting only the distinct ones).

The product of its digits is 1451520, while the sum is 54.

The spelling of 1261113987852 in words is "one trillion, two hundred sixty-one billion, one hundred thirteen million, nine hundred eighty-seven thousand, eight hundred fifty-two".