131217700 has 18 divisors (see below), whose sum is σ = 284742626. Its totient is φ = 52487040.

The previous prime is 131217689. The next prime is 131217733. The reversal of 131217700 is 7712131.

It can be written as a sum of positive squares in 3 ways, for example, as 527076 + 130690624 = 726^2 + 11432^2 .

It is a congruent number.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 655989 + ... + 656188.

Almost surely, 2^131217700 is an apocalyptic number.

131217700 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

131217700 is an abundant number, since it is smaller than the sum of its proper divisors (153524926).

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

131217700 is a wasteful number, since it uses less digits than its factorization.

131217700 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1312191 (or 1312184 counting only the distinct ones).

The product of its (nonzero) digits is 294, while the sum is 22.

The square root of 131217700 is about 11455.0294630787. The cubic root of 131217700 is about 508.1564866033.

Adding to 131217700 its reverse (7712131), we get a palindrome (138929831).

The spelling of 131217700 in words is "one hundred thirty-one million, two hundred seventeen thousand, seven hundred".