1216982201 has 2 divisors, whose sum is σ = 1216982202. Its totient is φ = 1216982200.

The previous prime is 1216982177. The next prime is 1216982227. The reversal of 1216982201 is 1022896121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 802248976 + 414733225 = 28324^2 + 20365^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1216982201 is a prime.

It is not a weakly prime, because it can be changed into another prime (1216982231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 608491100 + 608491101.

It is an arithmetic number, because the mean of its divisors is an integer number (608491101).

Almost surely, 2^1216982201 is an apocalyptic number.

It is an amenable number.

1216982201 is a deficient number, since it is larger than the sum of its proper divisors (1).

1216982201 is an equidigital number, since it uses as much as digits as its factorization.

1216982201 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 32.

The square root of 1216982201 is about 34885.2719783005. The cubic root of 1216982201 is about 1067.6479622762.

The spelling of 1216982201 in words is "one billion, two hundred sixteen million, nine hundred eighty-two thousand, two hundred one".