161281103 has 2 divisors, whose sum is σ = 161281104. Its totient is φ = 161281102.

The previous prime is 161281079. The next prime is 161281117. The reversal of 161281103 is 301182161.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 161281103 - 2¹⁰ = 161280079 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161281303) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80640551 + 80640552.

It is an arithmetic number, because the mean of its divisors is an integer number (80640552).

Almost surely, 2^161281103 is an apocalyptic number.

161281103 is a deficient number, since it is larger than the sum of its proper divisors (1).

161281103 is an equidigital number, since it uses as much as digits as its factorization.

161281103 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 23.

The square root of 161281103 is about 12699.6497195789. The cubic root of 161281103 is about 544.3286101652.

The spelling of 161281103 in words is "one hundred sixty-one million, two hundred eighty-one thousand, one hundred three".