1679831 has 2 divisors, whose sum is σ = 1679832. Its totient is φ = 1679830.

The previous prime is 1679807. The next prime is 1679833. The reversal of 1679831 is 1389761.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1679831 is a prime.

It is a super-2 number, since 2×1679831² = 5643664377122, which contains 22 as substring.

Together with 1679833, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 1679791 and 1679800.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1679833) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 839915 + 839916.

It is an arithmetic number, because the mean of its divisors is an integer number (839916).

2^1679831 is an apocalyptic number.

1679831 is a deficient number, since it is larger than the sum of its proper divisors (1).

1679831 is an equidigital number, since it uses as much as digits as its factorization.

1679831 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9072, while the sum is 35.

The square root of 1679831 is about 1296.0829448766. The cubic root of 1679831 is about 118.8744527200.

The spelling of 1679831 in words is "one million, six hundred seventy-nine thousand, eight hundred thirty-one".