131243236 has 6 divisors (see below), whose sum is σ = 229675670. Its totient is φ = 65621616.

The previous prime is 131243219. The next prime is 131243251. The reversal of 131243236 is 632342131.

It can be written as a sum of positive squares in only one way, i.e., 127464100 + 3779136 = 11290^2 + 1944^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 131243236.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16405401 + ... + 16405408.

Almost surely, 2^131243236 is an apocalyptic number.

It is an amenable number.

131243236 is a deficient number, since it is larger than the sum of its proper divisors (98432434).

131243236 is a wasteful number, since it uses less digits than its factorization.

131243236 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32810813 (or 32810811 counting only the distinct ones).

The product of its digits is 2592, while the sum is 25.

The square root of 131243236 is about 11456.1440284242. The cubic root of 131243236 is about 508.1894482194.

Adding to 131243236 its reverse (632342131), we get a palindrome (763585367).

The spelling of 131243236 in words is "one hundred thirty-one million, two hundred forty-three thousand, two hundred thirty-six".