1226995709 has 2 divisors, whose sum is σ = 1226995710. Its totient is φ = 1226995708.

The previous prime is 1226995691. The next prime is 1226995711. The reversal of 1226995709 is 9075996221.

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., 1028805625 + 198190084 = 32075^2 + 14078^2 .

It is a cyclic number.

It is not a de Polignac number, because 1226995709 - 2²⁰ = 1225947133 is a prime.

Together with 1226995711, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1226995799) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 613497854 + 613497855.

It is an arithmetic number, because the mean of its divisors is an integer number (613497855).

Almost surely, 2^1226995709 is an apocalyptic number.

It is an amenable number.

1226995709 is a deficient number, since it is larger than the sum of its proper divisors (1).

1226995709 is an equidigital number, since it uses as much as digits as its factorization.

1226995709 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 612360, while the sum is 50.

The square root of 1226995709 is about 35028.4985262001. The cubic root of 1226995709 is about 1070.5682220816.

The spelling of 1226995709 in words is "one billion, two hundred twenty-six million, nine hundred ninety-five thousand, seven hundred nine".