1200502161 has 32 divisors (see below), whose sum is σ = 1794481920. Its totient is φ = 793193472.

The previous prime is 1200502157. The next prime is 1200502189. The reversal of 1200502161 is 1612050021.

1200502161 is a `hidden beast` number, since 1 + 2 + 0 + 0 + 502 + 161 = 666.

It is not a de Polignac number, because 1200502161 - 2² = 1200502157 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1200502561) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2080305 + ... + 2080881.

It is an arithmetic number, because the mean of its divisors is an integer number (56077560).

Almost surely, 2^1200502161 is an apocalyptic number.

It is an amenable number.

1200502161 is a deficient number, since it is larger than the sum of its proper divisors (593979759).

1200502161 is a wasteful number, since it uses less digits than its factorization.

1200502161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1142 (or 1136 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 18.

The square root of 1200502161 is about 34648.2634629789. The cubic root of 1200502161 is about 1062.8067778693.

Adding to 1200502161 its reverse (1612050021), we get a palindrome (2812552182).

The spelling of 1200502161 in words is "one billion, two hundred million, five hundred two thousand, one hundred sixty-one".