623281 has 2 divisors, whose sum is σ = 623282. Its totient is φ = 623280.

The previous prime is 623279. The next prime is 623291. The reversal of 623281 is 182326.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 616225 + 7056 = 785^2 + 84^2 .

It is a cyclic number.

It is not a de Polignac number, because 623281 - 2¹ = 623279 is a prime.

It is a super-2 number, since 2×623281² = 776958409922, which contains 22 as substring.

Together with 623279, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (623221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 311640 + 311641.

It is an arithmetic number, because the mean of its divisors is an integer number (311641).

2⁶²³²⁸¹ is an apocalyptic number.

It is an amenable number.

623281 is a deficient number, since it is larger than the sum of its proper divisors (1).

623281 is an equidigital number, since it uses as much as digits as its factorization.

623281 is an evil number, because the sum of its binary digits is even.

The product of its digits is 576, while the sum is 22.

The square root of 623281 is about 789.4814754002. The cubic root of 623281 is about 85.4203400628.

The spelling of 623281 in words is "six hundred twenty-three thousand, two hundred eighty-one".