161205103 has 2 divisors, whose sum is σ = 161205104. Its totient is φ = 161205102.

The previous prime is 161205089. The next prime is 161205167. The reversal of 161205103 is 301502161.

It is a weak prime.

It is an emirp because it is prime and its reverse (301502161) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 161205103 - 2¹³ = 161196911 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161205193) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80602551 + 80602552.

It is an arithmetic number, because the mean of its divisors is an integer number (80602552).

Almost surely, 2^161205103 is an apocalyptic number.

161205103 is a deficient number, since it is larger than the sum of its proper divisors (1).

161205103 is an equidigital number, since it uses as much as digits as its factorization.

161205103 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 180, while the sum is 19.

The square root of 161205103 is about 12696.6571584807. The cubic root of 161205103 is about 544.2430959639.

Adding to 161205103 its reverse (301502161), we get a palindrome (462707264).

The spelling of 161205103 in words is "one hundred sixty-one million, two hundred five thousand, one hundred three".