1628491 has 2 divisors, whose sum is σ = 1628492. Its totient is φ = 1628490.

The previous prime is 1628489. The next prime is 1628507. The reversal of 1628491 is 1948261.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1628491 - 2¹ = 1628489 is a prime.

Together with 1628489, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1628401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 814245 + 814246.

It is an arithmetic number, because the mean of its divisors is an integer number (814246).

2^1628491 is an apocalyptic number.

1628491 is a deficient number, since it is larger than the sum of its proper divisors (1).

1628491 is an equidigital number, since it uses as much as digits as its factorization.

1628491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3456, while the sum is 31.

The square root of 1628491 is about 1276.1234266324. The cubic root of 1628491 is about 117.6508640093.

The spelling of 1628491 in words is "one million, six hundred twenty-eight thousand, four hundred ninety-one".