1601503 has 2 divisors, whose sum is σ = 1601504. Its totient is φ = 1601502.

The previous prime is 1601489. The next prime is 1601507. The reversal of 1601503 is 3051061.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1601503 - 2¹⁷ = 1470431 is a prime.

It is equal to p₁₂₁₂₃₇ and since 1601503 and 121237 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1601507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 800751 + 800752.

It is an arithmetic number, because the mean of its divisors is an integer number (800752).

2^1601503 is an apocalyptic number.

1601503 is a deficient number, since it is larger than the sum of its proper divisors (1).

1601503 is an equidigital number, since it uses as much as digits as its factorization.

1601503 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 90, while the sum is 16.

The square root of 1601503 is about 1265.5050375245. The cubic root of 1601503 is about 116.9973213890.

Adding to 1601503 its reverse (3051061), we get a palindrome (4652564).

The spelling of 1601503 in words is "one million, six hundred one thousand, five hundred three".