131217156 has 36 divisors (see below), whose sum is σ = 379072512. Its totient is φ = 37490544.

The previous prime is 131217137. The next prime is 131217157. The reversal of 131217156 is 651712131.

It is a tau number, because it is divible by the number of its divisors (36).

It is not an unprimeable number, because it can be changed into a prime (131217157) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 260100 + ... + 260603.

It is an arithmetic number, because the mean of its divisors is an integer number (10529792).

Almost surely, 2^131217156 is an apocalyptic number.

It is an amenable number.

131217156 is an abundant number, since it is smaller than the sum of its proper divisors (247855356).

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

131217156 is a wasteful number, since it uses less digits than its factorization.

131217156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 520720 (or 520715 counting only the distinct ones).

The product of its digits is 1260, while the sum is 27.

The square root of 131217156 is about 11455.0057180256. The cubic root of 131217156 is about 508.1557843669.

Adding to 131217156 its reverse (651712131), we get a palindrome (782929287).

The spelling of 131217156 in words is "one hundred thirty-one million, two hundred seventeen thousand, one hundred fifty-six".