1428895978121 has 2 divisors, whose sum is σ = 1428895978122. Its totient is φ = 1428895978120.

The previous prime is 1428895978079. The next prime is 1428895978129. The reversal of 1428895978121 is 1218795988241.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1417197392521 + 11698585600 = 1190461^2 + 108160^2 .

It is a cyclic number.

It is not a de Polignac number, because 1428895978121 - 2³⁸ = 1154018071177 is a prime.

It is a super-3 number, since 3×1428895978121³ (a number of 37 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (1428895978129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 714447989060 + 714447989061.

It is an arithmetic number, because the mean of its divisors is an integer number (714447989061).

Almost surely, 2^{1428895978121} is an apocalyptic number.

It is an amenable number.

1428895978121 is a deficient number, since it is larger than the sum of its proper divisors (1).

1428895978121 is an equidigital number, since it uses as much as digits as its factorization.

1428895978121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23224320, while the sum is 65.

The spelling of 1428895978121 in words is "one trillion, four hundred twenty-eight billion, eight hundred ninety-five million, nine hundred seventy-eight thousand, one hundred twenty-one".