981183221 has 2 divisors, whose sum is σ = 981183222. Its totient is φ = 981183220.

The previous prime is 981183209. The next prime is 981183277. The reversal of 981183221 is 122381189.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 924768100 + 56415121 = 30410^2 + 7511^2 .

It is a cyclic number.

It is not a de Polignac number, because 981183221 - 2¹⁸ = 980921077 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (981143221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 490591610 + 490591611.

It is an arithmetic number, because the mean of its divisors is an integer number (490591611).

Almost surely, 2^981183221 is an apocalyptic number.

It is an amenable number.

981183221 is a deficient number, since it is larger than the sum of its proper divisors (1).

981183221 is an equidigital number, since it uses as much as digits as its factorization.

981183221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6912, while the sum is 35.

The square root of 981183221 is about 31323.8442883373. The cubic root of 981183221 is about 993.6879825965.

The spelling of 981183221 in words is "nine hundred eighty-one million, one hundred eighty-three thousand, two hundred twenty-one".