308661 has 8 divisors (see below), whose sum is σ = 415104. Its totient is φ = 204000.

The previous prime is 308641. The next prime is 308663. The reversal of 308661 is 166803.

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

It is not a de Polignac number, because 308661 - 2⁶ = 308597 is a prime.

It is a super-2 number, since 2×308661² = 190543225842, which contains 22 as substring.

It is a nialpdrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (308663) 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 7 ways as a sum of consecutive naturals, for example, 36 + ... + 786.

It is an arithmetic number, because the mean of its divisors is an integer number (51888).

2³⁰⁸⁶⁶¹ is an apocalyptic number.

It is an amenable number.

308661 is a deficient number, since it is larger than the sum of its proper divisors (106443).

308661 is a wasteful number, since it uses less digits than its factorization.

308661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 891.

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 308661 is about 555.5726775139. The cubic root of 308661 is about 67.5814106887.

It can be divided in two parts, 308 and 661, that added together give a palindrome (969).

The spelling of 308661 in words is "three hundred eight thousand, six hundred sixty-one".