679531 has 2 divisors, whose sum is σ = 679532. Its totient is φ = 679530.

The previous prime is 679519. The next prime is 679537. The reversal of 679531 is 135976.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 679531 - 2⁷ = 679403 is a prime.

It is a super-2 number, since 2×679531² = 923524759922, which contains 22 as substring.

It is a Chen prime.

679531 is a lucky number.

It is a nialpdrome in base 15.

It is a junction number, because it is equal to n+sod(n) for n = 679493 and 679502.

It is not a weakly prime, because it can be changed into another prime (679537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 339765 + 339766.

It is an arithmetic number, because the mean of its divisors is an integer number (339766).

2⁶⁷⁹⁵³¹ is an apocalyptic number.

679531 is a deficient number, since it is larger than the sum of its proper divisors (1).

679531 is an equidigital number, since it uses as much as digits as its factorization.

679531 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5670, while the sum is 31.

The square root of 679531 is about 824.3367030528. The cubic root of 679531 is about 87.9163719982.

The spelling of 679531 in words is "six hundred seventy-nine thousand, five hundred thirty-one".