131211408 has 40 divisors (see below), whose sum is σ = 343745856. Its totient is φ = 43120000.

The previous prime is 131211407. The next prime is 131211433. The reversal of 131211408 is 804112131.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (131211407) 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, 15843 + ... + 22658.

Almost surely, 2^131211408 is an apocalyptic number.

It is an amenable number.

131211408 is an abundant number, since it is smaller than the sum of its proper divisors (212534448).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

131211408 is a wasteful number, since it uses less digits than its factorization.

131211408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38583 (or 38577 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 21.

The square root of 131211408 is about 11454.7548205974. The cubic root of 131211408 is about 508.1483642953.

Adding to 131211408 its reverse (804112131), we get a palindrome (935323539).

It can be divided in two parts, 1312 and 11408, that added together give a triangular number (12720 = T₁₅₉).

The spelling of 131211408 in words is "one hundred thirty-one million, two hundred eleven thousand, four hundred eight".