131331236 has 6 divisors (see below), whose sum is σ = 229829670. Its totient is φ = 65665616.

The previous prime is 131331229. The next prime is 131331269. The reversal of 131331236 is 632133131.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 118940836 + 12390400 = 10906^2 + 3520^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16416401 + ... + 16416408.

It is an arithmetic number, because the mean of its divisors is an integer number (38304945).

Almost surely, 2^131331236 is an apocalyptic number.

It is an amenable number.

131331236 is a deficient number, since it is larger than the sum of its proper divisors (98498434).

131331236 is a wasteful number, since it uses less digits than its factorization.

131331236 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32832813 (or 32832811 counting only the distinct ones).

The product of its digits is 972, while the sum is 23.

The square root of 131331236 is about 11459.9841186626. The cubic root of 131331236 is about 508.3030050048.

Adding to 131331236 its reverse (632133131), we get a palindrome (763464367).

The spelling of 131331236 in words is "one hundred thirty-one million, three hundred thirty-one thousand, two hundred thirty-six".