131918709 has 16 divisors (see below), whose sum is σ = 195955200. Its totient is φ = 78380736.

The previous prime is 131918693. The next prime is 131918719. The reversal of 131918709 is 907819131.

It is not a de Polignac number, because 131918709 - 2⁴ = 131918693 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131918719) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 57189 + ... + 59450.

It is an arithmetic number, because the mean of its divisors is an integer number (12247200).

Almost surely, 2^131918709 is an apocalyptic number.

It is an amenable number.

131918709 is a deficient number, since it is larger than the sum of its proper divisors (64036491).

131918709 is a wasteful number, since it uses less digits than its factorization.

131918709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116684.

The product of its (nonzero) digits is 13608, while the sum is 39.

The square root of 131918709 is about 11485.5870115550. The cubic root of 131918709 is about 509.0597940930.

The spelling of 131918709 in words is "one hundred thirty-one million, nine hundred eighteen thousand, seven hundred nine".