1679521 has 2 divisors, whose sum is σ = 1679522. Its totient is φ = 1679520.

The previous prime is 1679501. The next prime is 1679533. The reversal of 1679521 is 1259761.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1535121 + 144400 = 1239^2 + 380^2 .

It is a cyclic number.

It is not a de Polignac number, because 1679521 - 2⁹ = 1679009 is a prime.

It is a Chen prime.

It is a nialpdrome in base 6.

It is not a weakly prime, because it can be changed into another prime (1679501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 839760 + 839761.

It is an arithmetic number, because the mean of its divisors is an integer number (839761).

2^1679521 is an apocalyptic number.

It is an amenable number.

1679521 is a deficient number, since it is larger than the sum of its proper divisors (1).

1679521 is an equidigital number, since it uses as much as digits as its factorization.

1679521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3780, while the sum is 31.

The square root of 1679521 is about 1295.9633482472. The cubic root of 1679521 is about 118.8671398122.

The spelling of 1679521 in words is "one million, six hundred seventy-nine thousand, five hundred twenty-one".