1200221137 has 2 divisors, whose sum is σ = 1200221138. Its totient is φ = 1200221136.

The previous prime is 1200221111. The next prime is 1200221147. The reversal of 1200221137 is 7311220021.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1187767296 + 12453841 = 34464^2 + 3529^2 .

It is a cyclic number.

It is not a de Polignac number, because 1200221137 - 2²⁷ = 1066003409 is a prime.

It is not a weakly prime, because it can be changed into another prime (1200221107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 600110568 + 600110569.

It is an arithmetic number, because the mean of its divisors is an integer number (600110569).

Almost surely, 2^1200221137 is an apocalyptic number.

It is an amenable number.

1200221137 is a deficient number, since it is larger than the sum of its proper divisors (1).

1200221137 is an equidigital number, since it uses as much as digits as its factorization.

1200221137 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 168, while the sum is 19.

The square root of 1200221137 is about 34644.2078420044. The cubic root of 1200221137 is about 1062.7238410422.

Adding to 1200221137 its reverse (7311220021), we get a palindrome (8511441158).

The spelling of 1200221137 in words is "one billion, two hundred million, two hundred twenty-one thousand, one hundred thirty-seven".