428219117 has 2 divisors, whose sum is σ = 428219118. Its totient is φ = 428219116.

The previous prime is 428219081. The next prime is 428219123. The reversal of 428219117 is 711912824.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 252364996 + 175854121 = 15886^2 + 13261^2 .

It is a cyclic number.

It is not a de Polignac number, because 428219117 - 2¹⁰ = 428218093 is a prime.

It is a super-2 number, since 2×428219117² = 366743224328519378, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (428219417) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 214109558 + 214109559.

It is an arithmetic number, because the mean of its divisors is an integer number (214109559).

Almost surely, 2^428219117 is an apocalyptic number.

It is an amenable number.

428219117 is a deficient number, since it is larger than the sum of its proper divisors (1).

428219117 is an equidigital number, since it uses as much as digits as its factorization.

428219117 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8064, while the sum is 35.

The square root of 428219117 is about 20693.4558979403. The cubic root of 428219117 is about 753.7407877300.

The spelling of 428219117 in words is "four hundred twenty-eight million, two hundred nineteen thousand, one hundred seventeen".