1311023001020 has 48 divisors (see below), whose sum is σ = 3068524438560. Its totient is φ = 467584671744.

The previous prime is 1311023001017. The next prime is 1311023001049. The reversal of 1311023001020 is 201003201131.

It is a junction number, because it is equal to n+sod(n) for n = 1311023000986 and 1311023001004.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 101465909 + ... + 101478828.

It is an arithmetic number, because the mean of its divisors is an integer number (63927592470).

Almost surely, 2^{1311023001020} is an apocalyptic number.

1311023001020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1311023001020 is an abundant number, since it is smaller than the sum of its proper divisors (1757501437540).

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

1311023001020 is a wasteful number, since it uses less digits than its factorization.

1311023001020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 202944782 (or 202944780 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 14.

Adding to 1311023001020 its reverse (201003201131), we get a palindrome (1512026202151).

The spelling of 1311023001020 in words is "one trillion, three hundred eleven billion, twenty-three million, one thousand, twenty".