1609501 has 2 divisors, whose sum is σ = 1609502.
Its totient is φ = 1609500.
The previous prime is 1609493. The next prime is 1609507. The reversal of 1609501 is 1059061.
It is a strong prime.
It can be written as a sum of positive squares in only one way, i.e., 1428025 + 181476 = 1195^2 + 426^2
It is an emirp because it is prime and its reverse (1059061) is a distict prime.
It is a cyclic number.
It is not a de Polignac number, because 1609501 - 23 = 1609493 is a prime.
It is a plaindrome in base 13.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (1609507) 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, 804750 + 804751.
It is an arithmetic number, because the mean of its divisors is an integer number (804751).
21609501 is an apocalyptic number.
It is an amenable number.
1609501 is a deficient number, since it is larger than the sum of its proper divisors (1).
1609501 is an equidigital number, since it uses as much as digits as its factorization.
1609501 is an odious number, because the sum of its binary digits is odd.
The product of its (nonzero) digits is 270, while the sum is 22.
The square root of 1609501 is about 1268.6611052602.
The cubic root of 1609501 is about 117.1917618954.
The spelling of 1609501 in words is "one million, six hundred nine thousand, five hundred one".