621241 has 2 divisors, whose sum is σ = 621242. Its totient is φ = 621240.

The previous prime is 621239. The next prime is 621259. The reversal of 621241 is 142126.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 606841 + 14400 = 779^2 + 120^2 .

It is a cyclic number.

It is not a de Polignac number, because 621241 - 2¹ = 621239 is a prime.

Together with 621239, it forms a pair of twin primes.

It is a nialpdrome in base 15.

It is not a weakly prime, because it can be changed into another prime (621541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 310620 + 310621.

It is an arithmetic number, because the mean of its divisors is an integer number (310621).

2⁶²¹²⁴¹ is an apocalyptic number.

It is an amenable number.

621241 is a deficient number, since it is larger than the sum of its proper divisors (1).

621241 is an equidigital number, since it uses as much as digits as its factorization.

621241 is an evil number, because the sum of its binary digits is even.

The product of its digits is 96, while the sum is 16.

The square root of 621241 is about 788.1884292477. The cubic root of 621241 is about 85.3270445534.

Adding to 621241 its reverse (142126), we get a palindrome (763367).

The spelling of 621241 in words is "six hundred twenty-one thousand, two hundred forty-one".