1221134197 has 2 divisors, whose sum is σ = 1221134198. Its totient is φ = 1221134196.

The previous prime is 1221134171. The next prime is 1221134207. The reversal of 1221134197 is 7914311221.

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., 1179647716 + 41486481 = 34346^2 + 6441^2 .

It is a cyclic number.

It is not a de Polignac number, because 1221134197 - 2¹¹ = 1221132149 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1221134297) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610567098 + 610567099.

It is an arithmetic number, because the mean of its divisors is an integer number (610567099).

Almost surely, 2^1221134197 is an apocalyptic number.

It is an amenable number.

1221134197 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221134197 is an equidigital number, since it uses as much as digits as its factorization.

1221134197 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3024, while the sum is 31.

The square root of 1221134197 is about 34944.7306041984. The cubic root of 1221134197 is about 1068.8607541504.

The spelling of 1221134197 in words is "one billion, two hundred twenty-one million, one hundred thirty-four thousand, one hundred ninety-seven".