920821625 has 8 divisors (see below), whose sum is σ = 1149185544. Its totient is φ = 736657200.

The previous prime is 920821621. The next prime is 920821687. The reversal of 920821625 is 526128029.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 262796521 + 658025104 = 16211^2 + 25652^2 .

It is not a de Polignac number, because 920821625 - 2² = 920821621 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (920821621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3683162 + ... + 3683411.

It is an arithmetic number, because the mean of its divisors is an integer number (143648193).

Almost surely, 2^920821625 is an apocalyptic number.

It is an amenable number.

920821625 is a deficient number, since it is larger than the sum of its proper divisors (228363919).

920821625 is an equidigital number, since it uses as much as digits as its factorization.

920821625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7366588 (or 7366578 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 35.

The square root of 920821625 is about 30345.0428406354. The cubic root of 920821625 is about 972.8782702504.

The spelling of 920821625 in words is "nine hundred twenty million, eight hundred twenty-one thousand, six hundred twenty-five".