1220032181 has 2 divisors, whose sum is σ = 1220032182. Its totient is φ = 1220032180.

The previous prime is 1220032159. The next prime is 1220032207. The reversal of 1220032181 is 1812300221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1141426225 + 78605956 = 33785^2 + 8866^2 .

It is an emirp because it is prime and its reverse (1812300221) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1220032181 is a prime.

It is a super-2 number, since 2×1220032181² = 2976957045351233522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1220031181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610016090 + 610016091.

It is an arithmetic number, because the mean of its divisors is an integer number (610016091).

Almost surely, 2^1220032181 is an apocalyptic number.

It is an amenable number.

1220032181 is a deficient number, since it is larger than the sum of its proper divisors (1).

1220032181 is an equidigital number, since it uses as much as digits as its factorization.

1220032181 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 192, while the sum is 20.

The square root of 1220032181 is about 34928.9590597830. The cubic root of 1220032181 is about 1068.5391252453.

The spelling of 1220032181 in words is "one billion, two hundred twenty million, thirty-two thousand, one hundred eighty-one".