1225820117 has 2 divisors, whose sum is σ = 1225820118. Its totient is φ = 1225820116.

The previous prime is 1225820107. The next prime is 1225820143. The reversal of 1225820117 is 7110285221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 997991281 + 227828836 = 31591^2 + 15094^2 .

It is a cyclic number.

It is not a de Polignac number, because 1225820117 - 2¹⁸ = 1225557973 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1225820117.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1225820107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 612910058 + 612910059.

It is an arithmetic number, because the mean of its divisors is an integer number (612910059).

Almost surely, 2^1225820117 is an apocalyptic number.

It is an amenable number.

1225820117 is a deficient number, since it is larger than the sum of its proper divisors (1).

1225820117 is an equidigital number, since it uses as much as digits as its factorization.

1225820117 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2240, while the sum is 29.

The square root of 1225820117 is about 35011.7139968897. The cubic root of 1225820117 is about 1070.2262068694.

The spelling of 1225820117 in words is "one billion, two hundred twenty-five million, eight hundred twenty thousand, one hundred seventeen".