1227793121 has 2 divisors, whose sum is σ = 1227793122. Its totient is φ = 1227793120.

The previous prime is 1227793087. The next prime is 1227793139. The reversal of 1227793121 is 1213977221.

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., 799758400 + 428034721 = 28280^2 + 20689^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1227793121 is a prime.

It is not a weakly prime, because it can be changed into another prime (1227793621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 613896560 + 613896561.

It is an arithmetic number, because the mean of its divisors is an integer number (613896561).

Almost surely, 2^1227793121 is an apocalyptic number.

It is an amenable number.

1227793121 is a deficient number, since it is larger than the sum of its proper divisors (1).

1227793121 is an equidigital number, since it uses as much as digits as its factorization.

1227793121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10584, while the sum is 35.

The square root of 1227793121 is about 35039.8790094943. The cubic root of 1227793121 is about 1070.8000889833.

The spelling of 1227793121 in words is "one billion, two hundred twenty-seven million, seven hundred ninety-three thousand, one hundred twenty-one".