1225309997 has 2 divisors, whose sum is σ = 1225309998. Its totient is φ = 1225309996.

The previous prime is 1225309979. The next prime is 1225310017. The reversal of 1225309997 is 7999035221.

Together with previous prime (1225309979) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1223530441 + 1779556 = 34979^2 + 1334^2 .

It is an emirp because it is prime and its reverse (7999035221) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1225309997 - 2¹² = 1225305901 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1225309097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 612654998 + 612654999.

It is an arithmetic number, because the mean of its divisors is an integer number (612654999).

Almost surely, 2^1225309997 is an apocalyptic number.

It is an amenable number.

1225309997 is a deficient number, since it is larger than the sum of its proper divisors (1).

1225309997 is an equidigital number, since it uses as much as digits as its factorization.

1225309997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 306180, while the sum is 47.

The square root of 1225309997 is about 35004.4282484374. The cubic root of 1225309997 is about 1070.0777295266.

The spelling of 1225309997 in words is "one billion, two hundred twenty-five million, three hundred nine thousand, nine hundred ninety-seven".