981625 has 8 divisors (see below), whose sum is σ = 1225224. Its totient is φ = 785200.

The previous prime is 981623. The next prime is 981637. The reversal of 981625 is 526189.

It can be written as a sum of positive squares in 4 ways, for example, as 254016 + 727609 = 504^2 + 853^2 .

It is not a de Polignac number, because 981625 - 2¹ = 981623 is a prime.

It is a Duffinian number.

981625 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (981623) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3802 + ... + 4051.

It is an arithmetic number, because the mean of its divisors is an integer number (153153).

2⁹⁸¹⁶²⁵ is an apocalyptic number.

It is an amenable number.

981625 is a deficient number, since it is larger than the sum of its proper divisors (243599).

981625 is an equidigital number, since it uses as much as digits as its factorization.

981625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7868 (or 7858 counting only the distinct ones).

The product of its digits is 4320, while the sum is 31.

The square root of 981625 is about 990.7699026515. The cubic root of 981625 is about 99.3837096647.

The spelling of 981625 in words is "nine hundred eighty-one thousand, six hundred twenty-five".