506808989 has 2 divisors, whose sum is σ = 506808990. Its totient is φ = 506808988.

The previous prime is 506808961. The next prime is 506809003. The reversal of 506808989 is 989808605.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 255840025 + 250968964 = 15995^2 + 15842^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-506808989 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 506808989.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (506804989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 253404494 + 253404495.

It is an arithmetic number, because the mean of its divisors is an integer number (253404495).

Almost surely, 2^506808989 is an apocalyptic number.

It is an amenable number.

506808989 is a deficient number, since it is larger than the sum of its proper divisors (1).

506808989 is an equidigital number, since it uses as much as digits as its factorization.

506808989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1244160, while the sum is 53.

The square root of 506808989 is about 22512.4185506578. The cubic root of 506808989 is about 797.2871594563.

The spelling of 506808989 in words is "five hundred six million, eight hundred eight thousand, nine hundred eighty-nine".