428457331 has 2 divisors, whose sum is σ = 428457332. Its totient is φ = 428457330.

The previous prime is 428457329. The next prime is 428457349. The reversal of 428457331 is 133754824.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 428457331 - 2¹ = 428457329 is a prime.

It is a super-2 number, since 2×428457331² = 367151368975287122, which contains 22 as substring.

Together with 428457329, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (428457361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 214228665 + 214228666.

It is an arithmetic number, because the mean of its divisors is an integer number (214228666).

Almost surely, 2^428457331 is an apocalyptic number.

428457331 is a deficient number, since it is larger than the sum of its proper divisors (1).

428457331 is an equidigital number, since it uses as much as digits as its factorization.

428457331 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 80640, while the sum is 37.

The square root of 428457331 is about 20699.2108786784. The cubic root of 428457331 is about 753.8805279681.

It can be divided in two parts, 42845 and 7331, that added together give a square (50176 = 224²).

The spelling of 428457331 in words is "four hundred twenty-eight million, four hundred fifty-seven thousand, three hundred thirty-one".