1245421117 has 2 divisors, whose sum is σ = 1245421118. Its totient is φ = 1245421116.

The previous prime is 1245421109. The next prime is 1245421123. The reversal of 1245421117 is 7111245421.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1089396036 + 156025081 = 33006^2 + 12491^2 .

It is a cyclic number.

It is not a de Polignac number, because 1245421117 - 2³ = 1245421109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1245421127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 622710558 + 622710559.

It is an arithmetic number, because the mean of its divisors is an integer number (622710559).

Almost surely, 2^1245421117 is an apocalyptic number.

It is an amenable number.

1245421117 is a deficient number, since it is larger than the sum of its proper divisors (1).

1245421117 is an equidigital number, since it uses as much as digits as its factorization.

1245421117 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2240, while the sum is 28.

The square root of 1245421117 is about 35290.5244647908. The cubic root of 1245421117 is about 1075.9004151029.

Adding to 1245421117 its reverse (7111245421), we get a palindrome (8356666538).

The spelling of 1245421117 in words is "one billion, two hundred forty-five million, four hundred twenty-one thousand, one hundred seventeen".