1673509 has 2 divisors, whose sum is σ = 1673510. Its totient is φ = 1673508.

The previous prime is 1673489. The next prime is 1673513. The reversal of 1673509 is 9053761.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1664100 + 9409 = 1290^2 + 97^2 .

It is an emirp because it is prime and its reverse (9053761) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1673509 - 2⁷ = 1673381 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1673519) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 836754 + 836755.

It is an arithmetic number, because the mean of its divisors is an integer number (836755).

2^1673509 is an apocalyptic number.

It is an amenable number.

1673509 is a deficient number, since it is larger than the sum of its proper divisors (1).

1673509 is an equidigital number, since it uses as much as digits as its factorization.

1673509 is an odious number, because the sum of its binary digits is odd.

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

The square root of 1673509 is about 1293.6417587570. The cubic root of 1673509 is about 118.7251382856.

The spelling of 1673509 in words is "one million, six hundred seventy-three thousand, five hundred nine".