981667 has 4 divisors (see below), whose sum is σ = 986800. Its totient is φ = 976536.

The previous prime is 981653. The next prime is 981683. The reversal of 981667 is 766189.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 766189 = 317 ⋅2417.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-981667 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (981637) 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 3 ways as a sum of consecutive naturals, for example, 2268 + ... + 2665.

It is an arithmetic number, because the mean of its divisors is an integer number (246700).

2⁹⁸¹⁶⁶⁷ is an apocalyptic number.

981667 is a deficient number, since it is larger than the sum of its proper divisors (5133).

981667 is a wasteful number, since it uses less digits than its factorization.

981667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5132.

The product of its digits is 18144, while the sum is 37.

The square root of 981667 is about 990.7910980626. The cubic root of 981667 is about 99.3851270615.

The spelling of 981667 in words is "nine hundred eighty-one thousand, six hundred sixty-seven".