621801 has 12 divisors (see below), whose sum is σ = 914160. Its totient is φ = 407160.

The previous prime is 621799. The next prime is 621821. The reversal of 621801 is 108126.

It is not a de Polignac number, because 621801 - 2¹ = 621799 is a prime.

It is not an unprimeable number, because it can be changed into a prime (621821) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 55 + ... + 1116.

It is an arithmetic number, because the mean of its divisors is an integer number (76180).

2⁶²¹⁸⁰¹ is an apocalyptic number.

It is an amenable number.

621801 is a deficient number, since it is larger than the sum of its proper divisors (292359).

621801 is a wasteful number, since it uses less digits than its factorization.

621801 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1236 (or 1233 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

The square root of 621801 is about 788.5435942293. The cubic root of 621801 is about 85.3526753979.

Adding to 621801 its reverse (108126), we get a palindrome (729927).

The spelling of 621801 in words is "six hundred twenty-one thousand, eight hundred one".