1203306161 has 4 divisors (see below), whose sum is σ = 1203649524. Its totient is φ = 1202962800.

The previous prime is 1203306149. The next prime is 1203306179. The reversal of 1203306161 is 1616033021.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 436016161 + 767290000 = 20881^2 + 27700^2 .

It is a cyclic number.

It is not a de Polignac number, because 1203306161 - 2²⁶ = 1136197297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1203306061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 166370 + ... + 173451.

It is an arithmetic number, because the mean of its divisors is an integer number (300912381).

Almost surely, 2^1203306161 is an apocalyptic number.

It is an amenable number.

1203306161 is a deficient number, since it is larger than the sum of its proper divisors (343363).

1203306161 is an equidigital number, since it uses as much as digits as its factorization.

1203306161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 343362.

The product of its (nonzero) digits is 648, while the sum is 23.

The square root of 1203306161 is about 34688.7036511888. The cubic root of 1203306161 is about 1063.6335965968.

Adding to 1203306161 its reverse (1616033021), we get a palindrome (2819339182).

The spelling of 1203306161 in words is "one billion, two hundred three million, three hundred six thousand, one hundred sixty-one".