620549 has 2 divisors, whose sum is σ = 620550. Its totient is φ = 620548.

The previous prime is 620531. The next prime is 620561. The reversal of 620549 is 945026.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 611524 + 9025 = 782^2 + 95^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-620549 is a prime.

It is a super-2 number, since 2×620549² = 770162122802, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (620519) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 310274 + 310275.

It is an arithmetic number, because the mean of its divisors is an integer number (310275).

2⁶²⁰⁵⁴⁹ is an apocalyptic number.

It is an amenable number.

620549 is a deficient number, since it is larger than the sum of its proper divisors (1).

620549 is an equidigital number, since it uses as much as digits as its factorization.

620549 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 620549 is about 787.7493256106. The cubic root of 620549 is about 85.2953508670.

The spelling of 620549 in words is "six hundred twenty thousand, five hundred forty-nine".