428525212781 has 2 divisors, whose sum is σ = 428525212782. Its totient is φ = 428525212780.

The previous prime is 428525212751. The next prime is 428525212799. The reversal of 428525212781 is 187212525824.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 408204710281 + 20320502500 = 638909^2 + 142550^2 .

It is a cyclic number.

It is not a de Polignac number, because 428525212781 - 2¹⁴ = 428525196397 is a prime.

It is a super-2 number, since 2×428525212781² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (428525212751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 214262606390 + 214262606391.

It is an arithmetic number, because the mean of its divisors is an integer number (214262606391).

Almost surely, 2^428525212781 is an apocalyptic number.

It is an amenable number.

428525212781 is a deficient number, since it is larger than the sum of its proper divisors (1).

428525212781 is an equidigital number, since it uses as much as digits as its factorization.

428525212781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 716800, while the sum is 47.

The spelling of 428525212781 in words is "four hundred twenty-eight billion, five hundred twenty-five million, two hundred twelve thousand, seven hundred eighty-one".