1021625 has 16 divisors (see below), whose sum is σ = 1392768. Its totient is φ = 742000.

The previous prime is 1021621. The next prime is 1021627. The reversal of 1021625 is 5261201.

It is not a de Polignac number, because 1021625 - 2² = 1021621 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1021621) 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 in 15 ways as a sum of consecutive naturals, for example, 1004 + ... + 1746.

It is an arithmetic number, because the mean of its divisors is an integer number (87048).

2^1021625 is an apocalyptic number.

It is an amenable number.

1021625 is a deficient number, since it is larger than the sum of its proper divisors (371143).

1021625 is an equidigital number, since it uses as much as digits as its factorization.

1021625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 769 (or 759 counting only the distinct ones).

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

The square root of 1021625 is about 1010.7546685522. The cubic root of 1021625 is about 100.7156988647.

Adding to 1021625 its reverse (5261201), we get a palindrome (6282826).

The spelling of 1021625 in words is "one million, twenty-one thousand, six hundred twenty-five".