428213231 has 2 divisors, whose sum is σ = 428213232. Its totient is φ = 428213230.

The previous prime is 428213213. The next prime is 428213249. The reversal of 428213231 is 132312824.

Together with previous prime (428213213) it forms an Ormiston pair, because they use the same digits, order apart.

It is a balanced prime because it is at equal distance from previous prime (428213213) and next prime (428213249).

It is a cyclic number.

It is not a de Polignac number, because 428213231 - 2⁶ = 428213167 is a prime.

It is a super-2 number, since 2×428213231² = 366733142406918722, which contains 22 as substring.

It is equal to p_22758110 and since 428213231 and 22758110 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 428213231.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (428213831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 214106615 + 214106616.

It is an arithmetic number, because the mean of its divisors is an integer number (214106616).

Almost surely, 2^428213231 is an apocalyptic number.

428213231 is a deficient number, since it is larger than the sum of its proper divisors (1).

428213231 is an equidigital number, since it uses as much as digits as its factorization.

428213231 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2304, while the sum is 26.

The square root of 428213231 is about 20693.3136785774. The cubic root of 428213231 is about 753.7373342499.

The spelling of 428213231 in words is "four hundred twenty-eight million, two hundred thirteen thousand, two hundred thirty-one".