428551909 has 2 divisors, whose sum is σ = 428551910. Its totient is φ = 428551908.

The previous prime is 428551891. The next prime is 428551919. The reversal of 428551909 is 909155824.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 425390625 + 3161284 = 20625^2 + 1778^2 .

It is a cyclic number.

It is not a de Polignac number, because 428551909 - 2²¹ = 426454757 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (428551919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 214275954 + 214275955.

It is an arithmetic number, because the mean of its divisors is an integer number (214275955).

Almost surely, 2^428551909 is an apocalyptic number.

It is an amenable number.

428551909 is a deficient number, since it is larger than the sum of its proper divisors (1).

428551909 is an equidigital number, since it uses as much as digits as its factorization.

428551909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 129600, while the sum is 43.

The square root of 428551909 is about 20701.4953324633. The cubic root of 428551909 is about 753.9359946091.

The spelling of 428551909 in words is "four hundred twenty-eight million, five hundred fifty-one thousand, nine hundred nine".