1231001131331 has 8 divisors (see below), whose sum is σ = 1240455687504. Its totient is φ = 1221547448160.

The previous prime is 1231001131319. The next prime is 1231001131379. The reversal of 1231001131331 is 1331311001321.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1231001131331 is a prime.

It is a super-2 number, since 2×1231001131331² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1231001131231) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2769101 + ... + 3182753.

It is an arithmetic number, because the mean of its divisors is an integer number (155056960938).

Almost surely, 2^{1231001131331} is an apocalyptic number.

1231001131331 is a deficient number, since it is larger than the sum of its proper divisors (9454556173).

1231001131331 is a wasteful number, since it uses less digits than its factorization.

1231001131331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 436501.

The product of its (nonzero) digits is 162, while the sum is 20.

Adding to 1231001131331 its reverse (1331311001321), we get a palindrome (2562312132652).

The spelling of 1231001131331 in words is "one trillion, two hundred thirty-one billion, one million, one hundred thirty-one thousand, three hundred thirty-one".