201609503 has 2 divisors, whose sum is σ = 201609504. Its totient is φ = 201609502.

The previous prime is 201609493. The next prime is 201609521. The reversal of 201609503 is 305906102.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 201609503 - 2⁶ = 201609439 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201609593) 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, 100804751 + 100804752.

It is an arithmetic number, because the mean of its divisors is an integer number (100804752).

Almost surely, 2^201609503 is an apocalyptic number.

201609503 is a deficient number, since it is larger than the sum of its proper divisors (1).

201609503 is an equidigital number, since it uses as much as digits as its factorization.

201609503 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1620, while the sum is 26.

The square root of 201609503 is about 14198.9261213657. The cubic root of 201609503 is about 586.3680966481.

The spelling of 201609503 in words is "two hundred one million, six hundred nine thousand, five hundred three".