623261 has 2 divisors, whose sum is σ = 623262. Its totient is φ = 623260.

The previous prime is 623221. The next prime is 623263. The reversal of 623261 is 162326.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 383161 + 240100 = 619^2 + 490^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-623261 is a prime.

Together with 623263, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (623263) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 311630 + 311631.

It is an arithmetic number, because the mean of its divisors is an integer number (311631).

2⁶²³²⁶¹ is an apocalyptic number.

It is an amenable number.

623261 is a deficient number, since it is larger than the sum of its proper divisors (1).

623261 is an equidigital number, since it uses as much as digits as its factorization.

623261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 432, while the sum is 20.

The square root of 623261 is about 789.4688087569. The cubic root of 623261 is about 85.4194263898.

Adding to 623261 its reverse (162326), we get a palindrome (785587).

The spelling of 623261 in words is "six hundred twenty-three thousand, two hundred sixty-one".