781493 has 2 divisors, whose sum is σ = 781494. Its totient is φ = 781492.

The previous prime is 781483. The next prime is 781511. The reversal of 781493 is 394187.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 770884 + 10609 = 878^2 + 103^2 .

It is an emirp because it is prime and its reverse (394187) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 781493 - 2¹⁰ = 780469 is a prime.

It is a super-2 number, since 2×781493² = 1221462618098, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (781423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 390746 + 390747.

It is an arithmetic number, because the mean of its divisors is an integer number (390747).

2⁷⁸¹⁴⁹³ is an apocalyptic number.

It is an amenable number.

781493 is a deficient number, since it is larger than the sum of its proper divisors (1).

781493 is an equidigital number, since it uses as much as digits as its factorization.

781493 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6048, while the sum is 32.

The square root of 781493 is about 884.0209273541. The cubic root of 781493 is about 92.1103354858.

The spelling of 781493 in words is "seven hundred eighty-one thousand, four hundred ninety-three".