1428508121 has 2 divisors, whose sum is σ = 1428508122. Its totient is φ = 1428508120.

The previous prime is 1428508093. The next prime is 1428508153. The reversal of 1428508121 is 1218058241.

It is an a-pointer prime, because the next prime (1428508153) can be obtained adding 1428508121 to its sum of digits (32).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 821624896 + 606883225 = 28664^2 + 24635^2 .

It is a cyclic number.

It is not a de Polignac number, because 1428508121 - 2⁶ = 1428508057 is a prime.

It is not a weakly prime, because it can be changed into another prime (1428508721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 714254060 + 714254061.

It is an arithmetic number, because the mean of its divisors is an integer number (714254061).

Almost surely, 2^1428508121 is an apocalyptic number.

It is an amenable number.

1428508121 is a deficient number, since it is larger than the sum of its proper divisors (1).

1428508121 is an equidigital number, since it uses as much as digits as its factorization.

1428508121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5120, while the sum is 32.

The square root of 1428508121 is about 37795.6098111937. The cubic root of 1428508121 is about 1126.2312435269.

The spelling of 1428508121 in words is "one billion, four hundred twenty-eight million, five hundred eight thousand, one hundred twenty-one".