308813 has 2 divisors, whose sum is σ = 308814. Its totient is φ = 308812.

The previous prime is 308809. The next prime is 308827. The reversal of 308813 is 318803.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 299209 + 9604 = 547^2 + 98^2 .

It is a cyclic number.

It is not a de Polignac number, because 308813 - 2² = 308809 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (308213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 154406 + 154407.

It is an arithmetic number, because the mean of its divisors is an integer number (154407).

2³⁰⁸⁸¹³ is an apocalyptic number.

It is an amenable number.

308813 is a deficient number, since it is larger than the sum of its proper divisors (1).

308813 is an equidigital number, since it uses as much as digits as its factorization.

308813 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 308813 is about 555.7094564608. The cubic root of 308813 is about 67.5925023488.

The spelling of 308813 in words is "three hundred eight thousand, eight hundred thirteen".