1231001132011 has 4 divisors (see below), whose sum is σ = 1406858436592. Its totient is φ = 1055143827432.

The previous prime is 1231001131979. The next prime is 1231001132017. The reversal of 1231001132011 is 1102311001321.

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 1231001132011 - 2⁵ = 1231001131979 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1231001132017) 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, 87928652280 + ... + 87928652293.

It is an arithmetic number, because the mean of its divisors is an integer number (351714609148).

Almost surely, 2^{1231001132011} is an apocalyptic number.

1231001132011 is a deficient number, since it is larger than the sum of its proper divisors (175857304581).

1231001132011 is an equidigital number, since it uses as much as digits as its factorization.

1231001132011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 175857304580.

The product of its (nonzero) digits is 36, while the sum is 16.

Adding to 1231001132011 its reverse (1102311001321), we get a palindrome (2333312133332).

The spelling of 1231001132011 in words is "one trillion, two hundred thirty-one billion, one million, one hundred thirty-two thousand, eleven".