981438625 has 8 divisors (see below), whose sum is σ = 1224835560. Its totient is φ = 785150800.

The previous prime is 981438617. The next prime is 981438637. The reversal of 981438625 is 526834189.

It can be written as a sum of positive squares in 4 ways, for example, as 3500641 + 977937984 = 1871^2 + 31272^2 .

It is not a de Polignac number, because 981438625 - 2³ = 981438617 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3925630 + ... + 3925879.

It is an arithmetic number, because the mean of its divisors is an integer number (153104445).

Almost surely, 2^981438625 is an apocalyptic number.

It is an amenable number.

981438625 is a deficient number, since it is larger than the sum of its proper divisors (243396935).

981438625 is an equidigital number, since it uses as much as digits as its factorization.

981438625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7851524 (or 7851514 counting only the distinct ones).

The product of its digits is 414720, while the sum is 46.

The square root of 981438625 is about 31327.9208534496. The cubic root of 981438625 is about 993.7741947882.

The spelling of 981438625 in words is "nine hundred eighty-one million, four hundred thirty-eight thousand, six hundred twenty-five".