131670709 has 4 divisors (see below), whose sum is σ = 134155116. Its totient is φ = 129186304.

The previous prime is 131670691. The next prime is 131670727. The reversal of 131670709 is 907076131.

It is a happy number.

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

It is an interprime number because it is at equal distance from previous prime (131670691) and next prime (131670727).

It can be written as a sum of positive squares in 2 ways, for example, as 55457809 + 76212900 = 7447^2 + 8730^2 .

It is a cyclic number.

It is not a de Polignac number, because 131670709 - 2¹⁵ = 131637941 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131670769) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1242124 + ... + 1242229.

It is an arithmetic number, because the mean of its divisors is an integer number (33538779).

Almost surely, 2^131670709 is an apocalyptic number.

It is an amenable number.

131670709 is a deficient number, since it is larger than the sum of its proper divisors (2484407).

131670709 is an equidigital number, since it uses as much as digits as its factorization.

131670709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2484406.

The product of its (nonzero) digits is 7938, while the sum is 34.

The square root of 131670709 is about 11474.7857932076. The cubic root of 131670709 is about 508.7405924043.

The spelling of 131670709 in words is "one hundred thirty-one million, six hundred seventy thousand, seven hundred nine".