1425421169 has 2 divisors, whose sum is σ = 1425421170. Its totient is φ = 1425421168.

The previous prime is 1425421157. The next prime is 1425421171. The reversal of 1425421169 is 9611245241.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1231097569 + 194323600 = 35087^2 + 13940^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1425421169 is a prime.

It is a super-2 number, since 2×1425421169² = 4063651018066653122, which contains 22 as substring.

Together with 1425421171, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1425421069) 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, 712710584 + 712710585.

It is an arithmetic number, because the mean of its divisors is an integer number (712710585).

Almost surely, 2^1425421169 is an apocalyptic number.

It is an amenable number.

1425421169 is a deficient number, since it is larger than the sum of its proper divisors (1).

1425421169 is an equidigital number, since it uses as much as digits as its factorization.

1425421169 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17280, while the sum is 35.

The square root of 1425421169 is about 37754.7502839047. The cubic root of 1425421169 is about 1125.4194107643.

The spelling of 1425421169 in words is "one billion, four hundred twenty-five million, four hundred twenty-one thousand, one hundred sixty-nine".