161220803 has 8 divisors (see below), whose sum is σ = 169430448. Its totient is φ = 153213984.

The previous prime is 161220793. The next prime is 161220817. The reversal of 161220803 is 308022161.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 161220803 - 2¹² = 161216707 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161220883) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49076 + ... + 52257.

It is an arithmetic number, because the mean of its divisors is an integer number (21178806).

Almost surely, 2^161220803 is an apocalyptic number.

161220803 is a deficient number, since it is larger than the sum of its proper divisors (8209645).

161220803 is a wasteful number, since it uses less digits than its factorization.

161220803 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101413.

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 161220803 is about 12697.2754164033. The cubic root of 161220803 is about 544.2607635999.

Adding to 161220803 its reverse (308022161), we get a palindrome (469242964).

The spelling of 161220803 in words is "one hundred sixty-one million, two hundred twenty thousand, eight hundred three".