428709091 has 2 divisors, whose sum is σ = 428709092. Its totient is φ = 428709090.

The previous prime is 428709053. The next prime is 428709109. The reversal of 428709091 is 190907824.

Together with next prime (428709109) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 428709091 - 2¹¹ = 428707043 is a prime.

It is not a weakly prime, because it can be changed into another prime (428704091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 214354545 + 214354546.

It is an arithmetic number, because the mean of its divisors is an integer number (214354546).

Almost surely, 2^428709091 is an apocalyptic number.

428709091 is a deficient number, since it is larger than the sum of its proper divisors (1).

428709091 is an equidigital number, since it uses as much as digits as its factorization.

428709091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36288, while the sum is 40.

The square root of 428709091 is about 20705.2913768437. The cubic root of 428709091 is about 754.0281582263.

The spelling of 428709091 in words is "four hundred twenty-eight million, seven hundred nine thousand, ninety-one".