161501503 has 2 divisors, whose sum is σ = 161501504. Its totient is φ = 161501502.

The previous prime is 161501453. The next prime is 161501531. The reversal of 161501503 is 305105161.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161501503 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161501533) 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, 80750751 + 80750752.

It is an arithmetic number, because the mean of its divisors is an integer number (80750752).

Almost surely, 2^161501503 is an apocalyptic number.

161501503 is a deficient number, since it is larger than the sum of its proper divisors (1).

161501503 is an equidigital number, since it uses as much as digits as its factorization.

161501503 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 450, while the sum is 22.

The square root of 161501503 is about 12708.3241617453. The cubic root of 161501503 is about 544.5764495302.

Adding to 161501503 its reverse (305105161), we get a palindrome (466606664).

The spelling of 161501503 in words is "one hundred sixty-one million, five hundred one thousand, five hundred three".