1220061161 has 8 divisors (see below), whose sum is σ = 1331230944. Its totient is φ = 1108933920.

The previous prime is 1220061119. The next prime is 1220061163. The reversal of 1220061161 is 1611600221.

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 1220061161 - 2³⁰ = 146319337 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1220061163) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 95021 + ... + 107093.

It is an arithmetic number, because the mean of its divisors is an integer number (166403868).

Almost surely, 2^1220061161 is an apocalyptic number.

1220061161 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1220061161 is a deficient number, since it is larger than the sum of its proper divisors (111169783).

1220061161 is a wasteful number, since it uses less digits than its factorization.

1220061161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21271.

The product of its (nonzero) digits is 144, while the sum is 20.

The square root of 1220061161 is about 34929.3738993415. The cubic root of 1220061161 is about 1068.5475856830.

Adding to 1220061161 its reverse (1611600221), we get a palindrome (2831661382).

The spelling of 1220061161 in words is "one billion, two hundred twenty million, sixty-one thousand, one hundred sixty-one".