131531211 has 24 divisors (see below), whose sum is σ = 224621280. Its totient is φ = 72567936.

The previous prime is 131531207. The next prime is 131531221. The reversal of 131531211 is 112135131.

131531211 is a `hidden beast` number, since 131 + 531 + 2 + 1 + 1 = 666.

It is not a de Polignac number, because 131531211 - 2² = 131531207 is a prime.

It is not an unprimeable number, because it can be changed into a prime (131531201) 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, 34170 + ... + 37823.

It is an arithmetic number, because the mean of its divisors is an integer number (9359220).

Almost surely, 2^131531211 is an apocalyptic number.

131531211 is a deficient number, since it is larger than the sum of its proper divisors (93090069).

131531211 is a wasteful number, since it uses less digits than its factorization.

131531211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72035 (or 72032 counting only the distinct ones).

The product of its digits is 90, while the sum is 18.

The square root of 131531211 is about 11468.7057247102. The cubic root of 131531211 is about 508.5608678657.

Adding to 131531211 its reverse (112135131), we get a palindrome (243666342).

The spelling of 131531211 in words is "one hundred thirty-one million, five hundred thirty-one thousand, two hundred eleven".