161503 has 2 divisors, whose sum is σ = 161504. Its totient is φ = 161502.

The previous prime is 161471. The next prime is 161507. The reversal of 161503 is 305161.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 161503 - 2⁵ = 161471 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161507) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80751 + 80752.

It is an arithmetic number, because the mean of its divisors is an integer number (80752).

2¹⁶¹⁵⁰³ is an apocalyptic number.

161503 is a deficient number, since it is larger than the sum of its proper divisors (1).

161503 is an equidigital number, since it uses as much as digits as its factorization.

161503 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 161503 is about 401.8743584754. The cubic root of 161503 is about 54.4578132133.

Adding to 161503 its reverse (305161), we get a palindrome (466664).

It can be divided in two parts, 1 and 61503, that added together give a square (61504 = 248²).

The spelling of 161503 in words is "one hundred sixty-one thousand, five hundred three".