1311231001000 has 32 divisors (see below), whose sum is σ = 3068280544680. Its totient is φ = 524492400000.

The previous prime is 1311231000997. The next prime is 1311231001019. The reversal of 1311231001000 is 1001321131.

It can be written as a sum of positive squares in 4 ways, for example, as 59486234404 + 1251744766596 = 243898^2 + 1118814^2 .

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, 655614501 + ... + 655616500.

Almost surely, 2^{1311231001000} is an apocalyptic number.

1311231001000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1311231001000 is an abundant number, since it is smaller than the sum of its proper divisors (1757049543680).

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

1311231001000 is a wasteful number, since it uses less digits than its factorization.

1311231001000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1311231022 (or 1311231008 counting only the distinct ones).

The product of its (nonzero) digits is 18, while the sum is 13.

Adding to 1311231001000 its reverse (1001321131), we get a palindrome (1312232322131).

The spelling of 1311231001000 in words is "one trillion, three hundred eleven billion, two hundred thirty-one million, one thousand".