1220747161 has 4 divisors (see below), whose sum is σ = 1250521524. Its totient is φ = 1190972800.

The previous prime is 1220747153. The next prime is 1220747201. The reversal of 1220747161 is 1617470221.

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 540841536 + 679905625 = 23256^2 + 26075^2 .

It is a cyclic number.

It is not a de Polignac number, because 1220747161 - 2³ = 1220747153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1220747461) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14887120 + ... + 14887201.

It is an arithmetic number, because the mean of its divisors is an integer number (312630381).

Almost surely, 2^1220747161 is an apocalyptic number.

It is an amenable number.

1220747161 is a deficient number, since it is larger than the sum of its proper divisors (29774363).

1220747161 is an equidigital number, since it uses as much as digits as its factorization.

1220747161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29774362.

The product of its (nonzero) digits is 4704, while the sum is 31.

The square root of 1220747161 is about 34939.1923346834. The cubic root of 1220747161 is about 1068.7478178039.

The spelling of 1220747161 in words is "one billion, two hundred twenty million, seven hundred forty-seven thousand, one hundred sixty-one".