131217208 has 32 divisors (see below), whose sum is σ = 260272800. Its totient is φ = 61890048.

The previous prime is 131217197. The next prime is 131217223. The reversal of 131217208 is 802712131.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8548 + ... + 18316.

It is an arithmetic number, because the mean of its divisors is an integer number (8133525).

Almost surely, 2^131217208 is an apocalyptic number.

It is an amenable number.

131217208 is a deficient number, since it is larger than the sum of its proper divisors (129055592).

131217208 is a wasteful number, since it uses less digits than its factorization.

131217208 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9871 (or 9867 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 25.

The square root of 131217208 is about 11455.0079877755. The cubic root of 131217208 is about 508.1558514926.

Adding to 131217208 its reverse (802712131), we get a palindrome (933929339).

The spelling of 131217208 in words is "one hundred thirty-one million, two hundred seventeen thousand, two hundred eight".