781741 has 2 divisors, whose sum is σ = 781742. Its totient is φ = 781740.

The previous prime is 781733. The next prime is 781771. The reversal of 781741 is 147187.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 427716 + 354025 = 654^2 + 595^2 .

It is a cyclic number.

It is not a de Polignac number, because 781741 - 2³ = 781733 is a prime.

It is a super-2 number, since 2×781741² = 1222237982162, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (781721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 390870 + 390871.

It is an arithmetic number, because the mean of its divisors is an integer number (390871).

2⁷⁸¹⁷⁴¹ is an apocalyptic number.

It is an amenable number.

781741 is a deficient number, since it is larger than the sum of its proper divisors (1).

781741 is an equidigital number, since it uses as much as digits as its factorization.

781741 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1568, while the sum is 28.

The square root of 781741 is about 884.1611844002. The cubic root of 781741 is about 92.1200779263.

The spelling of 781741 in words is "seven hundred eighty-one thousand, seven hundred forty-one".