1509997 has 2 divisors, whose sum is σ = 1509998. Its totient is φ = 1509996.

The previous prime is 1509971. The next prime is 1510013. The reversal of 1509997 is 7999051.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1142761 + 367236 = 1069^2 + 606^2 .

It is an emirp because it is prime and its reverse (7999051) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1509997 - 2¹⁹ = 985709 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1509947) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 754998 + 754999.

It is an arithmetic number, because the mean of its divisors is an integer number (754999).

2^1509997 is an apocalyptic number.

It is an amenable number.

1509997 is a deficient number, since it is larger than the sum of its proper divisors (1).

1509997 is an equidigital number, since it uses as much as digits as its factorization.

1509997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 25515, while the sum is 40.

The square root of 1509997 is about 1228.8193520612. The cubic root of 1509997 is about 114.7251660145.

The spelling of 1509997 in words is "one million, five hundred nine thousand, nine hundred ninety-seven".