621055 has 8 divisors (see below), whose sum is σ = 749952. Its totient is φ = 493728.

The previous prime is 621043. The next prime is 621059. The reversal of 621055 is 550126.

It is a happy number.

621055 is a nontrivial binomial coefficient, being equal to C(1115, 2).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 621055 - 2¹¹ = 619007 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621059) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 837 + ... + 1393.

It is an arithmetic number, because the mean of its divisors is an integer number (93744).

2⁶²¹⁰⁵⁵ is an apocalyptic number.

621055 is the 1114-th triangular number.

621055 is the 372-nd centered nonagonal number.

621055 is a deficient number, since it is larger than the sum of its proper divisors (128897).

621055 is a wasteful number, since it uses less digits than its factorization.

621055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 785.

The product of its (nonzero) digits is 300, while the sum is 19.

The square root of 621055 is about 788.0704283248. The cubic root of 621055 is about 85.3185280440.

The spelling of 621055 in words is "six hundred twenty-one thousand, fifty-five".