493621 has 2 divisors, whose sum is σ = 493622. Its totient is φ = 493620.

The previous prime is 493607. The next prime is 493627. The reversal of 493621 is 126394.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 396900 + 96721 = 630^2 + 311^2 .

It is a cyclic number.

It is not a de Polignac number, because 493621 - 2⁹ = 493109 is a prime.

493621 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (493627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 246810 + 246811.

It is an arithmetic number, because the mean of its divisors is an integer number (246811).

2⁴⁹³⁶²¹ is an apocalyptic number.

It is an amenable number.

493621 is a deficient number, since it is larger than the sum of its proper divisors (1).

493621 is an equidigital number, since it uses as much as digits as its factorization.

493621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1296, while the sum is 25.

The square root of 493621 is about 702.5816678508. The cubic root of 493621 is about 79.0310725389.

It can be divided in two parts, 493 and 621, that multiplied together give a triangular number (306153 = T₇₈₂).

The spelling of 493621 in words is "four hundred ninety-three thousand, six hundred twenty-one".