1520009 has 2 divisors, whose sum is σ = 1520010. Its totient is φ = 1520008.

The previous prime is 1520003. The next prime is 1520011. The reversal of 1520009 is 9000251.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 990025 + 529984 = 995^2 + 728^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1520009 is a prime.

Together with 1520011, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1520003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 760004 + 760005.

It is an arithmetic number, because the mean of its divisors is an integer number (760005).

2^1520009 is an apocalyptic number.

It is an amenable number.

1520009 is a deficient number, since it is larger than the sum of its proper divisors (1).

1520009 is an equidigital number, since it uses as much as digits as its factorization.

1520009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 90, while the sum is 17.

The square root of 1520009 is about 1232.8864505704. The cubic root of 1520009 is about 114.9781685086.

The spelling of 1520009 in words is "one million, five hundred twenty thousand, nine".