621099 has 6 divisors (see below), whose sum is σ = 897156. Its totient is φ = 414060.

The previous prime is 621097. The next prime is 621113. The reversal of 621099 is 990126.

It is a happy number.

It is not a de Polignac number, because 621099 - 2¹ = 621097 is a prime.

621099 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (621097) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 34497 + ... + 34514.

It is an arithmetic number, because the mean of its divisors is an integer number (149526).

2⁶²¹⁰⁹⁹ is an apocalyptic number.

621099 is a deficient number, since it is larger than the sum of its proper divisors (276057).

621099 is a wasteful number, since it uses less digits than its factorization.

621099 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69017 (or 69014 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 27.

The square root of 621099 is about 788.0983441170. The cubic root of 621099 is about 85.3205428556.

Adding to 621099 its sum of digits (27), we get a palindrome (621126).

The spelling of 621099 in words is "six hundred twenty-one thousand, ninety-nine".