131211611 has 4 divisors (see below), whose sum is σ = 131539224. Its totient is φ = 130884000.

The previous prime is 131211599. The next prime is 131211617. The reversal of 131211611 is 116112131.

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 131211611 - 2¹⁴ = 131195227 is a prime.

It is a super-2 number, since 2×131211611² = 34432973722430642, which 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 131211611.

It is not an unprimeable number, because it can be changed into a prime (131211617) 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, 163205 + ... + 164006.

It is an arithmetic number, because the mean of its divisors is an integer number (32884806).

Almost surely, 2^131211611 is an apocalyptic number.

131211611 is a deficient number, since it is larger than the sum of its proper divisors (327613).

131211611 is an equidigital number, since it uses as much as digits as its factorization.

131211611 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 327612.

The product of its digits is 36, while the sum is 17.

The square root of 131211611 is about 11454.7636815432. The cubic root of 131211611 is about 508.1486263509.

Adding to 131211611 its reverse (116112131), we get a palindrome (247323742).

The spelling of 131211611 in words is "one hundred thirty-one million, two hundred eleven thousand, six hundred eleven".