679631 has 4 divisors (see below), whose sum is σ = 683064. Its totient is φ = 676200.

The previous prime is 679607. The next prime is 679633. The reversal of 679631 is 136976.

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 679631 - 2¹⁰ = 678607 is a prime.

It is a super-2 number, since 2×679631² = 923796592322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (679633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1400 + ... + 1821.

It is an arithmetic number, because the mean of its divisors is an integer number (170766).

2⁶⁷⁹⁶³¹ is an apocalyptic number.

679631 is a deficient number, since it is larger than the sum of its proper divisors (3433).

679631 is a wasteful number, since it uses less digits than its factorization.

679631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3432.

The product of its digits is 6804, while the sum is 32.

The square root of 679631 is about 824.3973556484. The cubic root of 679631 is about 87.9206843872.

The spelling of 679631 in words is "six hundred seventy-nine thousand, six hundred thirty-one".