674561 has 4 divisors (see below), whose sum is σ = 676800. Its totient is φ = 672324.

The previous prime is 674551. The next prime is 674563. The reversal of 674561 is 165476.

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 a de Polignac number, because none of the positive numbers 2^k-674561 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (674563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 581 + ... + 1298.

It is an arithmetic number, because the mean of its divisors is an integer number (169200).

2⁶⁷⁴⁵⁶¹ is an apocalyptic number.

It is an amenable number.

674561 is a deficient number, since it is larger than the sum of its proper divisors (2239).

674561 is a wasteful number, since it uses less digits than its factorization.

674561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2238.

The product of its digits is 5040, while the sum is 29.

The square root of 674561 is about 821.3166259123. The cubic root of 674561 is about 87.7015110772.

The spelling of 674561 in words is "six hundred seventy-four thousand, five hundred sixty-one".