781461 has 16 divisors (see below), whose sum is σ = 1173120. Its totient is φ = 514080.

The previous prime is 781453. The next prime is 781481. The reversal of 781461 is 164187.

It is a happy number.

It is not a de Polignac number, because 781461 - 2³ = 781453 is a prime.

It is a super-2 number, since 2×781461² = 1221362589042, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (781481) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2641 + ... + 2921.

It is an arithmetic number, because the mean of its divisors is an integer number (73320).

2⁷⁸¹⁴⁶¹ is an apocalyptic number.

It is an amenable number.

781461 is a deficient number, since it is larger than the sum of its proper divisors (391659).

781461 is a wasteful number, since it uses less digits than its factorization.

781461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 393 (or 387 counting only the distinct ones).

The product of its digits is 1344, while the sum is 27.

The square root of 781461 is about 884.0028280498. The cubic root of 781461 is about 92.1090782466.

It can be divided in two parts, 7814 and 61, that added together give a triangular number (7875 = T₁₂₅).

The spelling of 781461 in words is "seven hundred eighty-one thousand, four hundred sixty-one".