428245121 has 2 divisors, whose sum is σ = 428245122. Its totient is φ = 428245120.

The previous prime is 428245099. The next prime is 428245133. The reversal of 428245121 is 121542824.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 382750096 + 45495025 = 19564^2 + 6745^2 .

It is a cyclic number.

It is not a de Polignac number, because 428245121 - 2¹⁴ = 428228737 is a prime.

It is not a weakly prime, because it can be changed into another prime (428245621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 214122560 + 214122561.

It is an arithmetic number, because the mean of its divisors is an integer number (214122561).

Almost surely, 2^428245121 is an apocalyptic number.

It is an amenable number.

428245121 is a deficient number, since it is larger than the sum of its proper divisors (1).

428245121 is an equidigital number, since it uses as much as digits as its factorization.

428245121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5120, while the sum is 29.

The square root of 428245121 is about 20694.0842029794. The cubic root of 428245121 is about 753.7560446222.

Adding to 428245121 its reverse (121542824), we get a palindrome (549787945).

The spelling of 428245121 in words is "four hundred twenty-eight million, two hundred forty-five thousand, one hundred twenty-one".