161432503 has 2 divisors, whose sum is σ = 161432504. Its totient is φ = 161432502.

The previous prime is 161432501. The next prime is 161432563. The reversal of 161432503 is 305234161.

It is a weak prime.

It is an emirp because it is prime and its reverse (305234161) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 161432503 - 2¹ = 161432501 is a prime.

Together with 161432501, it forms a pair of twin primes.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161432501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80716251 + 80716252.

It is an arithmetic number, because the mean of its divisors is an integer number (80716252).

Almost surely, 2^161432503 is an apocalyptic number.

161432503 is a deficient number, since it is larger than the sum of its proper divisors (1).

161432503 is an equidigital number, since it uses as much as digits as its factorization.

161432503 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 161432503 is about 12705.6091156623. The cubic root of 161432503 is about 544.4988834253.

Adding to 161432503 its reverse (305234161), we get a palindrome (466666664).

The spelling of 161432503 in words is "one hundred sixty-one million, four hundred thirty-two thousand, five hundred three".