1198181213 has 2 divisors, whose sum is σ = 1198181214. Its totient is φ = 1198181212.

The previous prime is 1198181209. The next prime is 1198181221. The reversal of 1198181213 is 3121818911.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1197367609 + 813604 = 34603^2 + 902^2 .

It is a cyclic number.

It is not a de Polignac number, because 1198181213 - 2² = 1198181209 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1198181203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 599090606 + 599090607.

It is an arithmetic number, because the mean of its divisors is an integer number (599090607).

Almost surely, 2^1198181213 is an apocalyptic number.

It is an amenable number.

1198181213 is a deficient number, since it is larger than the sum of its proper divisors (1).

1198181213 is an equidigital number, since it uses as much as digits as its factorization.

1198181213 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3456, while the sum is 35.

The square root of 1198181213 is about 34614.7542675085. The cubic root of 1198181213 is about 1062.1214228284.

The spelling of 1198181213 in words is "one billion, one hundred ninety-eight million, one hundred eighty-one thousand, two hundred thirteen".