428525819 has 2 divisors, whose sum is σ = 428525820. Its totient is φ = 428525818.

The previous prime is 428525789. The next prime is 428525827. The reversal of 428525819 is 918525824.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 428525819 - 2¹⁶ = 428460283 is a prime.

It is a super-2 number, since 2×428525819² = 367268755099241522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 428525819.

It is not a weakly prime, because it can be changed into another prime (428525519) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 214262909 + 214262910.

It is an arithmetic number, because the mean of its divisors is an integer number (214262910).

Almost surely, 2^428525819 is an apocalyptic number.

428525819 is a deficient number, since it is larger than the sum of its proper divisors (1).

428525819 is an equidigital number, since it uses as much as digits as its factorization.

428525819 is an evil number, because the sum of its binary digits is even.

The product of its digits is 230400, while the sum is 44.

The square root of 428525819 is about 20700.8651751563. The cubic root of 428525819 is about 753.9206945650.

The spelling of 428525819 in words is "four hundred twenty-eight million, five hundred twenty-five thousand, eight hundred nineteen".