161286803 has 4 divisors (see below), whose sum is σ = 170774280. Its totient is φ = 151799328.

The previous prime is 161286793. The next prime is 161286809. The reversal of 161286803 is 308682161.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 161286803 - 2¹² = 161282707 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161286809) 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 in 3 ways as a sum of consecutive naturals, for example, 4743713 + ... + 4743746.

It is an arithmetic number, because the mean of its divisors is an integer number (42693570).

Almost surely, 2^161286803 is an apocalyptic number.

161286803 is a deficient number, since it is larger than the sum of its proper divisors (9487477).

161286803 is an equidigital number, since it uses as much as digits as its factorization.

161286803 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9487476.

The product of its (nonzero) digits is 13824, while the sum is 35.

The square root of 161286803 is about 12699.8741332345. The cubic root of 161286803 is about 544.3350226473.

The spelling of 161286803 in words is "one hundred sixty-one million, two hundred eighty-six thousand, eight hundred three".