1625021 has 2 divisors, whose sum is σ = 1625022. Its totient is φ = 1625020.

The previous prime is 1625017. The next prime is 1625027. The reversal of 1625021 is 1205261.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1188100 + 436921 = 1090^2 + 661^2 .

It is a cyclic number.

It is not a de Polignac number, because 1625021 - 2² = 1625017 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1625027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 812510 + 812511.

It is an arithmetic number, because the mean of its divisors is an integer number (812511).

2^1625021 is an apocalyptic number.

It is an amenable number.

1625021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1625021 is an equidigital number, since it uses as much as digits as its factorization.

1625021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 1625021 is about 1274.7631152493. The cubic root of 1625021 is about 117.5672408252.

The spelling of 1625021 in words is "one million, six hundred twenty-five thousand, twenty-one".