1311101020 has 24 divisors (see below), whose sum is σ = 2848255200. Its totient is φ = 506356032.

The previous prime is 1311101017. The next prime is 1311101069. The reversal of 1311101020 is 201011131.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a junction number, because it is equal to n+sod(n) for n = 1311100988 and 1311101006.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1129680 + ... + 1130839.

It is an arithmetic number, because the mean of its divisors is an integer number (118677300).

Almost surely, 2^1311101020 is an apocalyptic number.

1311101020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1311101020 is an abundant number, since it is smaller than the sum of its proper divisors (1537154180).

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

1311101020 is a wasteful number, since it uses less digits than its factorization.

1311101020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2260557 (or 2260555 counting only the distinct ones).

The product of its (nonzero) digits is 6, while the sum is 10.

The square root of 1311101020 is about 36209.1289594213. The cubic root of 1311101020 is about 1094.4906397130.

Adding to 1311101020 its reverse (201011131), we get a palindrome (1512112151).

The spelling of 1311101020 in words is "one billion, three hundred eleven million, one hundred one thousand, twenty".