667481 has 4 divisors (see below), whose sum is σ = 669312. Its totient is φ = 665652.

The previous prime is 667477. The next prime is 667487. The reversal of 667481 is 184766.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 184766 = 2 ⋅92383.

It is a cyclic number.

It is not a de Polignac number, because 667481 - 2² = 667477 is a prime.

It is a super-2 number, since 2×667481² = 891061770722, which contains 22 as substring.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 667481.

It is not an unprimeable number, because it can be changed into a prime (667487) 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, 161 + ... + 1166.

It is an arithmetic number, because the mean of its divisors is an integer number (167328).

2⁶⁶⁷⁴⁸¹ is an apocalyptic number.

It is an amenable number.

667481 is a deficient number, since it is larger than the sum of its proper divisors (1831).

667481 is a wasteful number, since it uses less digits than its factorization.

667481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1830.

The product of its digits is 8064, while the sum is 32.

The square root of 667481 is about 816.9951040245. The cubic root of 667481 is about 87.3936012854.

The spelling of 667481 in words is "six hundred sixty-seven thousand, four hundred eighty-one".