131121236 has 6 divisors (see below), whose sum is σ = 229462170. Its totient is φ = 65560616.

The previous prime is 131121181. The next prime is 131121241. The reversal of 131121236 is 632121131.

It can be written as a sum of positive squares in only one way, i.e., 113848900 + 17272336 = 10670^2 + 4156^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16390151 + ... + 16390158.

It is an arithmetic number, because the mean of its divisors is an integer number (38243695).

Almost surely, 2^131121236 is an apocalyptic number.

It is an amenable number.

131121236 is a deficient number, since it is larger than the sum of its proper divisors (98340934).

131121236 is a wasteful number, since it uses less digits than its factorization.

131121236 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32780313 (or 32780311 counting only the distinct ones).

The product of its digits is 216, while the sum is 20.

The square root of 131121236 is about 11450.8181367097. The cubic root of 131121236 is about 508.0319332232.

Adding to 131121236 its reverse (632121131), we get a palindrome (763242367).

The spelling of 131121236 in words is "one hundred thirty-one million, one hundred twenty-one thousand, two hundred thirty-six".