621461 has 2 divisors, whose sum is σ = 621462. Its totient is φ = 621460.

The previous prime is 621451. The next prime is 621473. The reversal of 621461 is 164126.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 592900 + 28561 = 770^2 + 169^2 .

It is a cyclic number.

It is not a de Polignac number, because 621461 - 2¹⁰ = 620437 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (621431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 310730 + 310731.

It is an arithmetic number, because the mean of its divisors is an integer number (310731).

2⁶²¹⁴⁶¹ is an apocalyptic number.

It is an amenable number.

621461 is a deficient number, since it is larger than the sum of its proper divisors (1).

621461 is an equidigital number, since it uses as much as digits as its factorization.

621461 is an evil number, because the sum of its binary digits is even.

The product of its digits is 288, while the sum is 20.

The square root of 621461 is about 788.3279774307. The cubic root of 621461 is about 85.3371156499.

Adding to 621461 its reverse (164126), we get a palindrome (785587).

The spelling of 621461 in words is "six hundred twenty-one thousand, four hundred sixty-one".