1628251 has 4 divisors (see below), whose sum is σ = 1632400. Its totient is φ = 1624104.

The previous prime is 1628227. The next prime is 1628261. The reversal of 1628251 is 1528261.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1628251 - 2⁹ = 1627739 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1628261) 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 in 3 ways as a sum of consecutive naturals, for example, 1416 + ... + 2293.

It is an arithmetic number, because the mean of its divisors is an integer number (408100).

2^1628251 is an apocalyptic number.

1628251 is a deficient number, since it is larger than the sum of its proper divisors (4149).

1628251 is an equidigital number, since it uses as much as digits as its factorization.

1628251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4148.

The product of its digits is 960, while the sum is 25.

The square root of 1628251 is about 1276.0293883763. The cubic root of 1628251 is about 117.6450840992.

The spelling of 1628251 in words is "one million, six hundred twenty-eight thousand, two hundred fifty-one".