1311050188 has 72 divisors (see below), whose sum is σ = 2719162880. Its totient is φ = 541719360.

The previous prime is 1311050173. The next prime is 1311050219. The reversal of 1311050188 is 8810501131.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a congruent number.

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 23 ways as a sum of consecutive naturals, for example, 6213403 + ... + 6213613.

Almost surely, 2^1311050188 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1311050188, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1359581440).

1311050188 is an abundant number, since it is smaller than the sum of its proper divisors (1408112692).

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

1311050188 is a wasteful number, since it uses less digits than its factorization.

1311050188 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 407 (or 352 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 28.

The square root of 1311050188 is about 36208.4270301818. The cubic root of 1311050188 is about 1094.4764948922.

The spelling of 1311050188 in words is "one billion, three hundred eleven million, fifty thousand, one hundred eighty-eight".