621315 has 12 divisors (see below), whose sum is σ = 1077024. Its totient is φ = 331344.

The previous prime is 621301. The next prime is 621317. The reversal of 621315 is 513126.

621315 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 621315 - 2⁸ = 621059 is a prime.

It is not an unprimeable number, because it can be changed into a prime (621317) 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, 6859 + ... + 6948.

It is an arithmetic number, because the mean of its divisors is an integer number (89752).

2⁶²¹³¹⁵ is an apocalyptic number.

621315 is a deficient number, since it is larger than the sum of its proper divisors (455709).

621315 is a wasteful number, since it uses less digits than its factorization.

621315 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13818 (or 13815 counting only the distinct ones).

The product of its digits is 180, while the sum is 18.

The square root of 621315 is about 788.2353709394. The cubic root of 621315 is about 85.3304323694.

It can be divided in two parts, 6 and 21315, that added together give a triangular number (21321 = T₂₀₆).

The spelling of 621315 in words is "six hundred twenty-one thousand, three hundred fifteen".