308881 has 4 divisors (see below), whose sum is σ = 310000. Its totient is φ = 307764.

The previous prime is 308857. The next prime is 308887. The reversal of 308881 is 188803.

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 a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 308881 - 2⁵ = 308849 is a prime.

It is a super-2 number, since 2×308881² = 190814944322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (308887) 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, 190 + ... + 808.

It is an arithmetic number, because the mean of its divisors is an integer number (77500).

2³⁰⁸⁸⁸¹ is an apocalyptic number.

308881 is the 352-nd centered pentagonal number.

It is an amenable number.

308881 is a deficient number, since it is larger than the sum of its proper divisors (1119).

308881 is an equidigital number, since it uses as much as digits as its factorization.

308881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1118.

The product of its (nonzero) digits is 1536, while the sum is 28.

The square root of 308881 is about 555.7706361441. The cubic root of 308881 is about 67.5974632289.

It can be divided in two parts, 30 and 8881, that added together give a triangular number (8911 = T₁₃₃).

The spelling of 308881 in words is "three hundred eight thousand, eight hundred eighty-one".