428611109 has 4 divisors (see below), whose sum is σ = 429016140. Its totient is φ = 428206080.

The previous prime is 428611019. The next prime is 428611111. The reversal of 428611109 is 901116824.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 175483009 + 253128100 = 13247^2 + 15910^2 .

It is a cyclic number.

It is not a de Polignac number, because 428611109 - 2¹⁶ = 428545573 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (428611409) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 200924 + ... + 203045.

It is an arithmetic number, because the mean of its divisors is an integer number (107254035).

Almost surely, 2^428611109 is an apocalyptic number.

It is an amenable number.

428611109 is a deficient number, since it is larger than the sum of its proper divisors (405031).

428611109 is a wasteful number, since it uses less digits than its factorization.

428611109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 405030.

The product of its (nonzero) digits is 3456, while the sum is 32.

The square root of 428611109 is about 20702.9251314881. The cubic root of 428611109 is about 753.9707091558.

The spelling of 428611109 in words is "four hundred twenty-eight million, six hundred eleven thousand, one hundred nine".