308861 has 4 divisors (see below), whose sum is σ = 352992. Its totient is φ = 264732.

The previous prime is 308857. The next prime is 308887. The reversal of 308861 is 168803.

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.

It is a cyclic number.

It is not a de Polignac number, because 308861 - 2² = 308857 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a nialpdrome in base 13.

It is a zygodrome in base 13.

It is a self number, because there is not a number n which added to its sum of digits gives 308861.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (308801) 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, 22055 + ... + 22068.

It is an arithmetic number, because the mean of its divisors is an integer number (88248).

2³⁰⁸⁸⁶¹ is an apocalyptic number.

It is an amenable number.

308861 is a deficient number, since it is larger than the sum of its proper divisors (44131).

308861 is an equidigital number, since it uses as much as digits as its factorization.

308861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44130.

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 308861 is about 555.7526428187. The cubic root of 308861 is about 67.5960042221.

Adding to 308861 its product of nonzero digits (1152), we get a palindrome (310013).

The spelling of 308861 in words is "three hundred eight thousand, eight hundred sixty-one".