1245440117 has 2 divisors, whose sum is σ = 1245440118. Its totient is φ = 1245440116.

The previous prime is 1245440093. The next prime is 1245440171. The reversal of 1245440117 is 7110445421.

It is a happy number.

Together with next prime (1245440171) 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., 854626756 + 390813361 = 29234^2 + 19769^2 .

It is a cyclic number.

It is not a de Polignac number, because 1245440117 - 2¹⁰ = 1245439093 is a prime.

It is a super-2 number, since 2×1245440117² = 3102242170065947378, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1245440117.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1245440197) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 622720058 + 622720059.

It is an arithmetic number, because the mean of its divisors is an integer number (622720059).

Almost surely, 2^1245440117 is an apocalyptic number.

It is an amenable number.

1245440117 is a deficient number, since it is larger than the sum of its proper divisors (1).

1245440117 is an equidigital number, since it uses as much as digits as its factorization.

1245440117 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4480, while the sum is 29.

The square root of 1245440117 is about 35290.7936578366. The cubic root of 1245440117 is about 1075.9058863457.

Adding to 1245440117 its reverse (7110445421), we get a palindrome (8355885538).

The spelling of 1245440117 in words is "one billion, two hundred forty-five million, four hundred forty thousand, one hundred seventeen".