494511781 has 2 divisors, whose sum is σ = 494511782. Its totient is φ = 494511780.

The previous prime is 494511763. The next prime is 494511833. The reversal of 494511781 is 187115494.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 450076225 + 44435556 = 21215^2 + 6666^2 .

It is a cyclic number.

It is not a de Polignac number, because 494511781 - 2²³ = 486123173 is a prime.

It is a super-2 number, since 2×494511781² = 489083803095583922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (494511751) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 247255890 + 247255891.

It is an arithmetic number, because the mean of its divisors is an integer number (247255891).

Almost surely, 2^494511781 is an apocalyptic number.

It is an amenable number.

494511781 is a deficient number, since it is larger than the sum of its proper divisors (1).

494511781 is an equidigital number, since it uses as much as digits as its factorization.

494511781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 40320, while the sum is 40.

The square root of 494511781 is about 22237.6208484631. The cubic root of 494511781 is about 790.7858339778.

The spelling of 494511781 in words is "four hundred ninety-four million, five hundred eleven thousand, seven hundred eighty-one".