1231101111131 has 4 divisors (see below), whose sum is σ = 1235034341832. Its totient is φ = 1227167880432.

The previous prime is 1231101111113. The next prime is 1231101111133. The reversal of 1231101111131 is 1311111011321.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1231101111131 - 2¹⁴ = 1231101094747 is a prime.

It is a super-2 number, since 2×1231101111131² (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 (1231101111133) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1966614881 + ... + 1966615506.

It is an arithmetic number, because the mean of its divisors is an integer number (308758585458).

Almost surely, 2^{1231101111131} is an apocalyptic number.

1231101111131 is a deficient number, since it is larger than the sum of its proper divisors (3933230701).

1231101111131 is an equidigital number, since it uses as much as digits as its factorization.

1231101111131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3933230700.

The product of its (nonzero) digits is 18, while the sum is 17.

Adding to 1231101111131 its reverse (1311111011321), we get a palindrome (2542212122452).

The spelling of 1231101111131 in words is "one trillion, two hundred thirty-one billion, one hundred one million, one hundred eleven thousand, one hundred thirty-one".