1311230100 has 36 divisors (see below), whose sum is σ = 3793826624. Its totient is φ = 349661280.

The previous prime is 1311230047. The next prime is 1311230153. The reversal of 1311230100 is 10321131.

It is an interprime number because it is at equal distance from previous prime (1311230047) and next prime (1311230153).

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2185084 + ... + 2185683.

Almost surely, 2^1311230100 is an apocalyptic number.

1311230100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1311230100 is an abundant number, since it is smaller than the sum of its proper divisors (2482596524).

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

1311230100 is a wasteful number, since it uses less digits than its factorization.

1311230100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4370784 (or 4370777 counting only the distinct ones).

The product of its (nonzero) digits is 18, while the sum is 12.

The square root of 1311230100 is about 36210.9113389873. The cubic root of 1311230100 is about 1094.5265566545.

Adding to 1311230100 its reverse (10321131), we get a palindrome (1321551231).

The spelling of 1311230100 in words is "one billion, three hundred eleven million, two hundred thirty thousand, one hundred".