621261 has 6 divisors (see below), whose sum is σ = 897390. Its totient is φ = 414168.

The previous prime is 621259. The next prime is 621289. The reversal of 621261 is 162126.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 476100 + 145161 = 690^2 + 381^2 .

It is not a de Polignac number, because 621261 - 2¹ = 621259 is a prime.

It is a plaindrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621241) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 34506 + ... + 34523.

It is an arithmetic number, because the mean of its divisors is an integer number (149565).

2⁶²¹²⁶¹ is an apocalyptic number.

It is an amenable number.

621261 is a deficient number, since it is larger than the sum of its proper divisors (276129).

621261 is a wasteful number, since it uses less digits than its factorization.

621261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69035 (or 69032 counting only the distinct ones).

The product of its digits is 144, while the sum is 18.

The square root of 621261 is about 788.2011164671. The cubic root of 621261 is about 85.3279602058.

Adding to 621261 its reverse (162126), we get a palindrome (783387).

The spelling of 621261 in words is "six hundred twenty-one thousand, two hundred sixty-one".