623641 has 2 divisors, whose sum is σ = 623642. Its totient is φ = 623640.

The previous prime is 623633. The next prime is 623653. The reversal of 623641 is 146326.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 585225 + 38416 = 765^2 + 196^2 .

It is a cyclic number.

It is not a de Polignac number, because 623641 - 2³ = 623633 is a prime.

It is an Ulam number.

It is a plaindrome in base 14.

It is not a weakly prime, because it can be changed into another prime (623621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 311820 + 311821.

It is an arithmetic number, because the mean of its divisors is an integer number (311821).

2⁶²³⁶⁴¹ is an apocalyptic number.

It is an amenable number.

623641 is a deficient number, since it is larger than the sum of its proper divisors (1).

623641 is an equidigital number, since it uses as much as digits as its factorization.

623641 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 864, while the sum is 22.

The square root of 623641 is about 789.7094402374. The cubic root of 623641 is about 85.4367828357.

Adding to 623641 its reverse (146326), we get a palindrome (769967).

The spelling of 623641 in words is "six hundred twenty-three thousand, six hundred forty-one".