7131865 has 8 divisors (see below), whose sum is σ = 9216648. Its totient is φ = 5266560.

The previous prime is 7131853. The next prime is 7131869. The reversal of 7131865 is 5681317.

7131865 is nontrivially palindromic in base 11.

It can be written as a sum of positive squares in 4 ways, for example, as 725904 + 6405961 = 852^2 + 2531^2 .

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

It is not a de Polignac number, because 7131865 - 2⁹ = 7131353 is a prime.

It is a Duffinian number.

7131865 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (7131869) 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, 54796 + ... + 54925.

It is an arithmetic number, because the mean of its divisors is an integer number (1152081).

Almost surely, 2^7131865 is an apocalyptic number.

It is an amenable number.

7131865 is a deficient number, since it is larger than the sum of its proper divisors (2084783).

7131865 is a wasteful number, since it uses less digits than its factorization.

7131865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109739.

The product of its digits is 5040, while the sum is 31.

The square root of 7131865 is about 2670.5551857245. Note that the first 3 decimals coincide. The cubic root of 7131865 is about 192.4868378025.

The spelling of 7131865 in words is "seven million, one hundred thirty-one thousand, eight hundred sixty-five".