131213811 has 8 divisors (see below), whose sum is σ = 175007440. Its totient is φ = 87448032.

The previous prime is 131213809. The next prime is 131213833. The reversal of 131213811 is 118312131.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 131213811 - 2¹ = 131213809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131213851) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9801 + ... + 18933.

It is an arithmetic number, because the mean of its divisors is an integer number (21875930).

Almost surely, 2^131213811 is an apocalyptic number.

131213811 is a deficient number, since it is larger than the sum of its proper divisors (43793629).

131213811 is an equidigital number, since it uses as much as digits as its factorization.

131213811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13925.

The product of its digits is 144, while the sum is 21.

The square root of 131213811 is about 11454.8597110571. The cubic root of 131213811 is about 508.1514663453.

Adding to 131213811 its reverse (118312131), we get a palindrome (249525942).

The spelling of 131213811 in words is "one hundred thirty-one million, two hundred thirteen thousand, eight hundred eleven".