498781 has 2 divisors, whose sum is σ = 498782. Its totient is φ = 498780.

The previous prime is 498779. The next prime is 498787. The reversal of 498781 is 187894.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 443556 + 55225 = 666^2 + 235^2 .

It is a cyclic number.

It is not a de Polignac number, because 498781 - 2¹ = 498779 is a prime.

It is a super-2 number, since 2×498781² = 497564971922, which contains 22 as substring.

Together with 498779, it forms a pair of twin primes.

It is an alternating number because its digits alternate between even and odd.

It is a self number, because there is not a number n which added to its sum of digits gives 498781.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (498787) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 249390 + 249391.

It is an arithmetic number, because the mean of its divisors is an integer number (249391).

2⁴⁹⁸⁷⁸¹ is an apocalyptic number.

It is an amenable number.

498781 is a deficient number, since it is larger than the sum of its proper divisors (1).

498781 is an equidigital number, since it uses as much as digits as its factorization.

498781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16128, while the sum is 37.

The square root of 498781 is about 706.2442920123. The cubic root of 498781 is about 79.3054987131.

Subtracting from 498781 its product of digits (16128), we obtain a triangular number (482653 = T₉₈₂).

The spelling of 498781 in words is "four hundred ninety-eight thousand, seven hundred eighty-one".