867661 has 4 divisors (see below), whose sum is σ = 877500. Its totient is φ = 857824.

The previous prime is 867653. The next prime is 867677. The reversal of 867661 is 166768.

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 145161 + 722500 = 381^2 + 850^2 .

It is a cyclic number.

It is not a de Polignac number, because 867661 - 2³ = 867653 is a prime.

It is a super-2 number, since 2×867661² = 1505671221842, 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 (867631) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4786 + ... + 4963.

It is an arithmetic number, because the mean of its divisors is an integer number (219375).

2⁸⁶⁷⁶⁶¹ is an apocalyptic number.

It is an amenable number.

867661 is a deficient number, since it is larger than the sum of its proper divisors (9839).

867661 is an equidigital number, since it uses as much as digits as its factorization.

867661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9838.

The product of its digits is 12096, while the sum is 34.

The square root of 867661 is about 931.4832258286. The cubic root of 867661 is about 95.3783984482.

The spelling of 867661 in words is "eight hundred sixty-seven thousand, six hundred sixty-one".