505220489 has 2 divisors, whose sum is σ = 505220490. Its totient is φ = 505220488.

The previous prime is 505220479. The next prime is 505220557. The reversal of 505220489 is 984022505.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 505125625 + 94864 = 22475^2 + 308^2 .

It is a cyclic number.

It is not a de Polignac number, because 505220489 - 2²⁸ = 236785033 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (505220479) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 252610244 + 252610245.

It is an arithmetic number, because the mean of its divisors is an integer number (252610245).

Almost surely, 2^505220489 is an apocalyptic number.

It is an amenable number.

505220489 is a deficient number, since it is larger than the sum of its proper divisors (1).

505220489 is an equidigital number, since it uses as much as digits as its factorization.

505220489 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 28800, while the sum is 35.

The square root of 505220489 is about 22477.1103347383. The cubic root of 505220489 is about 796.4533041093.

The spelling of 505220489 in words is "five hundred five million, two hundred twenty thousand, four hundred eighty-nine".