1225267817 has 4 divisors (see below), whose sum is σ = 1225364820. Its totient is φ = 1225170816.

The previous prime is 1225267787. The next prime is 1225267837. The reversal of 1225267817 is 7187625221.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 417344041 + 807923776 = 20429^2 + 28424^2 .

It is a cyclic number.

It is not a de Polignac number, because 1225267817 - 2¹⁶ = 1225202281 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1225267837) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26108 + ... + 55965.

It is an arithmetic number, because the mean of its divisors is an integer number (306341205).

Almost surely, 2^1225267817 is an apocalyptic number.

It is an amenable number.

1225267817 is a deficient number, since it is larger than the sum of its proper divisors (97003).

1225267817 is an equidigital number, since it uses as much as digits as its factorization.

1225267817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97002.

The product of its digits is 94080, while the sum is 41.

The square root of 1225267817 is about 35003.8257480522. The cubic root of 1225267817 is about 1070.0654506212.

The spelling of 1225267817 in words is "one billion, two hundred twenty-five million, two hundred sixty-seven thousand, eight hundred seventeen".