131231213011 has 4 divisors (see below), whose sum is σ = 131233004032. Its totient is φ = 131229421992.

The previous prime is 131231212967. The next prime is 131231213063. The reversal of 131231213011 is 110312132131.

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 131231213011 - 2¹⁷ = 131231081939 is a prime.

It is a super-2 number, since 2×131231213011² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 131231213011.

It is not an unprimeable number, because it can be changed into a prime (131231213081) 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, 780696 + ... + 933781.

It is an arithmetic number, because the mean of its divisors is an integer number (32808251008).

Almost surely, 2^131231213011 is an apocalyptic number.

131231213011 is a deficient number, since it is larger than the sum of its proper divisors (1791021).

131231213011 is an equidigital number, since it uses as much as digits as its factorization.

131231213011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1791020.

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

Adding to 131231213011 its reverse (110312132131), we get a palindrome (241543345142).

The spelling of 131231213011 in words is "one hundred thirty-one billion, two hundred thirty-one million, two hundred thirteen thousand, eleven".