1311771950380 has 48 divisors (see below), whose sum is σ = 2895473407680. Its totient is φ = 498231861248.

The previous prime is 1311771950369. The next prime is 1311771950387. The reversal of 1311771950380 is 830591771131.

It is a Harshad number since it is a multiple of its sum of digits (46).

It is a self number, because there is not a number n which added to its sum of digits gives 1311771950380.

It is not an unprimeable number, because it can be changed into a prime (1311771950387) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10344565 + ... + 10470604.

It is an arithmetic number, because the mean of its divisors is an integer number (60322362660).

Almost surely, 2^{1311771950380} is an apocalyptic number.

1311771950380 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1311771950380 is an abundant number, since it is smaller than the sum of its proper divisors (1583701457300).

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

1311771950380 is a wasteful number, since it uses less digits than its factorization.

1311771950380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20815338 (or 20815336 counting only the distinct ones).

The product of its (nonzero) digits is 158760, while the sum is 46.

The spelling of 1311771950380 in words is "one trillion, three hundred eleven billion, seven hundred seventy-one million, nine hundred fifty thousand, three hundred eighty".