621497 has 4 divisors (see below), whose sum is σ = 623076. Its totient is φ = 619920.

The previous prime is 621473. The next prime is 621521. The reversal of 621497 is 794126.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 794126 = 2 ⋅397063.

It is an interprime number because it is at equal distance from previous prime (621473) and next prime (621521).

It can be written as a sum of positive squares in 2 ways, for example, as 274576 + 346921 = 524^2 + 589^2 .

It is a cyclic number.

It is not a de Polignac number, because 621497 - 2⁸ = 621241 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (621427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 347 + ... + 1167.

It is an arithmetic number, because the mean of its divisors is an integer number (155769).

2⁶²¹⁴⁹⁷ is an apocalyptic number.

It is an amenable number.

621497 is a deficient number, since it is larger than the sum of its proper divisors (1579).

621497 is an equidigital number, since it uses as much as digits as its factorization.

621497 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1578.

The product of its digits is 3024, while the sum is 29.

The square root of 621497 is about 788.3508102362. The cubic root of 621497 is about 85.3387634213.

The spelling of 621497 in words is "six hundred twenty-one thousand, four hundred ninety-seven".