781713 has 6 divisors (see below), whose sum is σ = 1129154. Its totient is φ = 521136.

The previous prime is 781681. The next prime is 781721. The reversal of 781713 is 317187.

It can be written as a sum of positive squares in only one way, i.e., 627264 + 154449 = 792^2 + 393^2 .

It is not a de Polignac number, because 781713 - 2⁵ = 781681 is a prime.

It is a super-2 number, since 2×781713² = 1222150428738, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (781733) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 43420 + ... + 43437.

2⁷⁸¹⁷¹³ is an apocalyptic number.

It is an amenable number.

781713 is a deficient number, since it is larger than the sum of its proper divisors (347441).

781713 is a wasteful number, since it uses less digits than its factorization.

781713 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86863 (or 86860 counting only the distinct ones).

The product of its digits is 1176, while the sum is 27.

The square root of 781713 is about 884.1453500415. The cubic root of 781713 is about 92.1189780765.

The spelling of 781713 in words is "seven hundred eighty-one thousand, seven hundred thirteen".