621025 has 6 divisors (see below), whose sum is σ = 770102. Its totient is φ = 496800.

The previous prime is 621017. The next prime is 621029. The reversal of 621025 is 520126.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 81 + 620944 = 9^2 + 788^2 .

It is not a de Polignac number, because 621025 - 2³ = 621017 is a prime.

It is a Duffinian number.

It is a plaindrome in base 14.

It is not an unprimeable number, because it can be changed into a prime (621029) 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, 12396 + ... + 12445.

2⁶²¹⁰²⁵ is an apocalyptic number.

It is an amenable number.

621025 is a deficient number, since it is larger than the sum of its proper divisors (149077).

621025 is a wasteful number, since it uses less digits than its factorization.

621025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24851 (or 24846 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 621025 is about 788.0513942631. The cubic root of 621025 is about 85.3171542542.

The spelling of 621025 in words is "six hundred twenty-one thousand, twenty-five".