1188633221 has 2 divisors, whose sum is σ = 1188633222. Its totient is φ = 1188633220.

The previous prime is 1188633197. The next prime is 1188633227. The reversal of 1188633221 is 1223368811.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 988410721 + 200222500 = 31439^2 + 14150^2 .

It is a cyclic number.

It is not a de Polignac number, because 1188633221 - 2¹⁴ = 1188616837 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1188633227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 594316610 + 594316611.

It is an arithmetic number, because the mean of its divisors is an integer number (594316611).

Almost surely, 2^1188633221 is an apocalyptic number.

It is an amenable number.

1188633221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1188633221 is an equidigital number, since it uses as much as digits as its factorization.

1188633221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13824, while the sum is 35.

The square root of 1188633221 is about 34476.5604577951. The cubic root of 1188633221 is about 1059.2926397929.

The spelling of 1188633221 in words is "one billion, one hundred eighty-eight million, six hundred thirty-three thousand, two hundred twenty-one".