308981 has 4 divisors (see below), whose sum is σ = 310464. Its totient is φ = 307500.

The previous prime is 308951. The next prime is 308989. The reversal of 308981 is 189803.

It is a happy number.

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 an emirpimes, since its reverse is a distinct semiprime: 189803 = 59 ⋅3217.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-308981 is a prime.

It is a super-2 number, since 2×308981² = 190938516722, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 308981.

It is not an unprimeable number, because it can be changed into a prime (308989) 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, 365 + ... + 866.

It is an arithmetic number, because the mean of its divisors is an integer number (77616).

2³⁰⁸⁹⁸¹ is an apocalyptic number.

It is an amenable number.

308981 is a deficient number, since it is larger than the sum of its proper divisors (1483).

308981 is a wasteful number, since it uses less digits than its factorization.

308981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1482.

The product of its (nonzero) digits is 1728, while the sum is 29.

The square root of 308981 is about 555.8605940342. The cubic root of 308981 is about 67.6047573184.

The spelling of 308981 in words is "three hundred eight thousand, nine hundred eighty-one".