621013 has 2 divisors, whose sum is σ = 621014. Its totient is φ = 621012.

The previous prime is 621007. The next prime is 621017. The reversal of 621013 is 310126.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 412164 + 208849 = 642^2 + 457^2 .

It is a cyclic number.

It is not a de Polignac number, because 621013 - 2⁵ = 620981 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 620984 and 621002.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (621017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 310506 + 310507.

It is an arithmetic number, because the mean of its divisors is an integer number (310507).

2⁶²¹⁰¹³ is an apocalyptic number.

It is an amenable number.

621013 is a deficient number, since it is larger than the sum of its proper divisors (1).

621013 is an equidigital number, since it uses as much as digits as its factorization.

621013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 621013 is about 788.0437805097. The cubic root of 621013 is about 85.3166047259.

Adding to 621013 its reverse (310126), we get a palindrome (931139).

The spelling of 621013 in words is "six hundred twenty-one thousand, thirteen".