428213249 has 2 divisors, whose sum is σ = 428213250. Its totient is φ = 428213248.

The previous prime is 428213231. The next prime is 428213263. The reversal of 428213249 is 942312824.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 379003024 + 49210225 = 19468^2 + 7015^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-428213249 is a prime.

It is not a weakly prime, because it can be changed into another prime (428213749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 214106624 + 214106625.

It is an arithmetic number, because the mean of its divisors is an integer number (214106625).

Almost surely, 2^428213249 is an apocalyptic number.

It is an amenable number.

428213249 is a deficient number, since it is larger than the sum of its proper divisors (1).

428213249 is an equidigital number, since it uses as much as digits as its factorization.

428213249 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27648, while the sum is 35.

The square root of 428213249 is about 20693.3141135005. The cubic root of 428213249 is about 753.7373448111.

The spelling of 428213249 in words is "four hundred twenty-eight million, two hundred thirteen thousand, two hundred forty-nine".