677491 has 4 divisors (see below), whose sum is σ = 680184. Its totient is φ = 674800.

The previous prime is 677473. The next prime is 677531. The reversal of 677491 is 194776.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 677491 - 2⁵ = 677459 is a prime.

It is a Duffinian number.

677491 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (677441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 925 + ... + 1486.

It is an arithmetic number, because the mean of its divisors is an integer number (170046).

2⁶⁷⁷⁴⁹¹ is an apocalyptic number.

677491 is a deficient number, since it is larger than the sum of its proper divisors (2693).

677491 is a wasteful number, since it uses less digits than its factorization.

677491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2692.

The product of its digits is 10584, while the sum is 34.

The square root of 677491 is about 823.0984145289. The cubic root of 677491 is about 87.8283067631.

The spelling of 677491 in words is "six hundred seventy-seven thousand, four hundred ninety-one".