7131709 has 8 divisors (see below), whose sum is σ = 7945560. Its totient is φ = 6355776.

The previous prime is 7131703. The next prime is 7131727. The reversal of 7131709 is 9071317.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 956484 + 6175225 = 978^2 + 2485^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 7131709 - 2³ = 7131701 is a prime.

It is a super-2 number, since 2×7131709² = 101722546521362, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7131701) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 9082 + ... + 9835.

It is an arithmetic number, because the mean of its divisors is an integer number (993195).

Almost surely, 2^7131709 is an apocalyptic number.

It is an amenable number.

7131709 is a deficient number, since it is larger than the sum of its proper divisors (813851).

7131709 is a wasteful number, since it uses less digits than its factorization.

7131709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18959.

The product of its (nonzero) digits is 1323, while the sum is 28.

The square root of 7131709 is about 2670.5259781549. The cubic root of 7131709 is about 192.4854343283.

The spelling of 7131709 in words is "seven million, one hundred thirty-one thousand, seven hundred nine".