131217206 has 4 divisors (see below), whose sum is σ = 196825812. Its totient is φ = 65608602.

The previous prime is 131217197. The next prime is 131217223. The reversal of 131217206 is 602712131.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32804300 + ... + 32804303.

It is an arithmetic number, because the mean of its divisors is an integer number (49206453).

Almost surely, 2^131217206 is an apocalyptic number.

131217206 is a deficient number, since it is larger than the sum of its proper divisors (65608606).

131217206 is an equidigital number, since it uses as much as digits as its factorization.

131217206 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65608605.

The product of its (nonzero) digits is 504, while the sum is 23.

The square root of 131217206 is about 11455.0079004774. The cubic root of 131217206 is about 508.1558489108.

Adding to 131217206 its reverse (602712131), we get a palindrome (733929337).

The spelling of 131217206 in words is "one hundred thirty-one million, two hundred seventeen thousand, two hundred six".