1311020231100 has 72 divisors (see below), whose sum is σ = 3793400956800. Its totient is φ = 349588582080.

The previous prime is 1311020231083. The next prime is 1311020231113. The reversal of 1311020231100 is 11320201131.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 1311020231100.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6926319 + ... + 7113081.

It is an arithmetic number, because the mean of its divisors is an integer number (52686124400).

Almost surely, 2^{1311020231100} is an apocalyptic number.

1311020231100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1311020231100 is an abundant number, since it is smaller than the sum of its proper divisors (2482380725700).

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

1311020231100 is a wasteful number, since it uses less digits than its factorization.

1311020231100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210179 (or 210172 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 15.

Adding to 1311020231100 its reverse (11320201131), we get a palindrome (1322340432231).

The spelling of 1311020231100 in words is "one trillion, three hundred eleven billion, twenty million, two hundred thirty-one thousand, one hundred".