1311985620 has 96 divisors (see below), whose sum is σ = 4452819840. Its totient is φ = 318055680.

The previous prime is 1311985541. The next prime is 1311985667. The reversal of 1311985620 is 265891131.

1311985620 is a `hidden beast` number, since 1 + 3 + 1 + 1 + 98 + 562 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 104497 + ... + 116376.

It is an arithmetic number, because the mean of its divisors is an integer number (46383540).

Almost surely, 2^1311985620 is an apocalyptic number.

1311985620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1311985620 is an abundant number, since it is smaller than the sum of its proper divisors (3140834220).

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

1311985620 is a wasteful number, since it uses less digits than its factorization.

1311985620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 220902 (or 220894 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 36.

The square root of 1311985620 is about 36221.3420513376. The cubic root of 1311985620 is about 1094.7367353587.

The spelling of 1311985620 in words is "one billion, three hundred eleven million, nine hundred eighty-five thousand, six hundred twenty".