131231320011 has 24 divisors (see below), whose sum is σ = 206924053440. Its totient is φ = 79482092400.

The previous prime is 131231319943. The next prime is 131231320037. The reversal of 131231320011 is 110023132131.

131231320011 is a `hidden beast` number, since 1 + 312 + 31 + 320 + 0 + 1 + 1 = 666.

It is not a de Polignac number, because 131231320011 - 2²³ = 131222931403 is a prime.

It is not an unprimeable number, because it can be changed into a prime (131231320081) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 281341 + ... + 584478.

It is an arithmetic number, because the mean of its divisors is an integer number (8621835560).

Almost surely, 2^131231320011 is an apocalyptic number.

131231320011 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

131231320011 is a deficient number, since it is larger than the sum of its proper divisors (75692733429).

131231320011 is a wasteful number, since it uses less digits than its factorization.

131231320011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 867367 (or 867364 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

Adding to 131231320011 its reverse (110023132131), we get a palindrome (241254452142).

The spelling of 131231320011 in words is "one hundred thirty-one billion, two hundred thirty-one million, three hundred twenty thousand, eleven".