1428432121 has 2 divisors, whose sum is σ = 1428432122. Its totient is φ = 1428432120.

The previous prime is 1428432113. The next prime is 1428432199. The reversal of 1428432121 is 1212348241.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1286226496 + 142205625 = 35864^2 + 11925^2 .

It is a cyclic number.

It is not a de Polignac number, because 1428432121 - 2³ = 1428432113 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1428432121.

It is not a weakly prime, because it can be changed into another prime (1428442121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 714216060 + 714216061.

It is an arithmetic number, because the mean of its divisors is an integer number (714216061).

Almost surely, 2^1428432121 is an apocalyptic number.

It is an amenable number.

1428432121 is a deficient number, since it is larger than the sum of its proper divisors (1).

1428432121 is an equidigital number, since it uses as much as digits as its factorization.

1428432121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3072, while the sum is 28.

The square root of 1428432121 is about 37794.6043900449. The cubic root of 1428432121 is about 1126.2112704536.

The spelling of 1428432121 in words is "one billion, four hundred twenty-eight million, four hundred thirty-two thousand, one hundred twenty-one".