131718785 has 12 divisors (see below), whose sum is σ = 173738964. Its totient is φ = 95795040.

The previous prime is 131718781. The next prime is 131718799. The reversal of 131718785 is 587817131.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 26615281 + 105103504 = 5159^2 + 10252^2 .

It is not a de Polignac number, because 131718785 - 2² = 131718781 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (131718781) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 108254 + ... + 109463.

It is an arithmetic number, because the mean of its divisors is an integer number (14478247).

Almost surely, 2^131718785 is an apocalyptic number.

It is an amenable number.

131718785 is a deficient number, since it is larger than the sum of its proper divisors (42020179).

131718785 is a wasteful number, since it uses less digits than its factorization.

131718785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 217744 (or 217733 counting only the distinct ones).

The product of its digits is 47040, while the sum is 41.

The square root of 131718785 is about 11476.8804559427. The cubic root of 131718785 is about 508.8025024949.

It can be divided in two parts, 1317 and 18785, that added together give a palindrome (20102).

The spelling of 131718785 in words is "one hundred thirty-one million, seven hundred eighteen thousand, seven hundred eighty-five".