67131005 has 4 divisors (see below), whose sum is σ = 80557212. Its totient is φ = 53704800.

The previous prime is 67130957. The next prime is 67131007. The reversal of 67131005 is 50013176.

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

It can be written as a sum of positive squares in 2 ways, for example, as 21473956 + 45657049 = 4634^2 + 6757^2 .

It is not a de Polignac number, because 67131005 - 2⁶ = 67130941 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 (67131007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6713096 + ... + 6713105.

It is an arithmetic number, because the mean of its divisors is an integer number (20139303).

Almost surely, 2^67131005 is an apocalyptic number.

It is an amenable number.

67131005 is a deficient number, since it is larger than the sum of its proper divisors (13426207).

67131005 is a wasteful number, since it uses less digits than its factorization.

67131005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13426206.

The product of its (nonzero) digits is 630, while the sum is 23.

The square root of 67131005 is about 8193.3512679489. The cubic root of 67131005 is about 406.4193556622.

It can be divided in two parts, 67 and 131005, that added together give a 17-th power (131072 = 2¹⁷).

The spelling of 67131005 in words is "sixty-seven million, one hundred thirty-one thousand, five".