1131231020311 has 32 divisors (see below), whose sum is σ = 1337561321472. Its totient is φ = 936700502400.

The previous prime is 1131231020291. The next prime is 1131231020323. The reversal of 1131231020311 is 1130201321311.

It is a cyclic number.

It is not a de Polignac number, because 1131231020311 - 2³¹ = 1129083536663 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1131231020341) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7727085 + ... + 7872121.

It is an arithmetic number, because the mean of its divisors is an integer number (41798791296).

Almost surely, 2^{1131231020311} is an apocalyptic number.

1131231020311 is a deficient number, since it is larger than the sum of its proper divisors (206330301161).

1131231020311 is a wasteful number, since it uses less digits than its factorization.

1131231020311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145399.

The product of its (nonzero) digits is 108, while the sum is 19.

Adding to 1131231020311 its reverse (1130201321311), we get a palindrome (2261432341622).

The spelling of 1131231020311 in words is "one trillion, one hundred thirty-one billion, two hundred thirty-one million, twenty thousand, three hundred eleven".