681465 has 16 divisors (see below), whose sum is σ = 1100736. Its totient is φ = 360000.

The previous prime is 681451. The next prime is 681481. The reversal of 681465 is 564186.

It is not a de Polignac number, because 681465 - 2⁴ = 681449 is a prime.

It is an Ulam number.

It is a Curzon number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 681465.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2590 + ... + 2840.

It is an arithmetic number, because the mean of its divisors is an integer number (68796).

2⁶⁸¹⁴⁶⁵ is an apocalyptic number.

It is an amenable number.

681465 is a deficient number, since it is larger than the sum of its proper divisors (419271).

681465 is a wasteful number, since it uses less digits than its factorization.

681465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 440.

The product of its digits is 5760, while the sum is 30.

The square root of 681465 is about 825.5089339311. The cubic root of 681465 is about 87.9996986904. Note that the first 3 decimals are identical.

The spelling of 681465 in words is "six hundred eighty-one thousand, four hundred sixty-five".