681477 has 4 divisors (see below), whose sum is σ = 908640. Its totient is φ = 454316.

The previous prime is 681451. The next prime is 681481. The reversal of 681477 is 774186.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 681477 - 2⁸ = 681221 is a prime.

It is a D-number.

681477 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681407) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 113577 + ... + 113582.

It is an arithmetic number, because the mean of its divisors is an integer number (227160).

2⁶⁸¹⁴⁷⁷ is an apocalyptic number.

It is an amenable number.

681477 is a deficient number, since it is larger than the sum of its proper divisors (227163).

681477 is a wasteful number, since it uses less digits than its factorization.

681477 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 227162.

The product of its digits is 9408, while the sum is 33.

The square root of 681477 is about 825.5162021426. The cubic root of 681477 is about 88.0002152199. Note that the first 3 decimals are identical.

The spelling of 681477 in words is "six hundred eighty-one thousand, four hundred seventy-seven".