981861625 has 8 divisors (see below), whose sum is σ = 1225363464. Its totient is φ = 785489200.

The previous prime is 981861599. The next prime is 981861653. The reversal of 981861625 is 526168189.

It can be written as a sum of positive squares in 4 ways, for example, as 13220496 + 968641129 = 3636^2 + 31123^2 .

It is not a de Polignac number, because 981861625 - 2¹¹ = 981859577 is a prime.

It is a Duffinian number.

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, 3927322 + ... + 3927571.

It is an arithmetic number, because the mean of its divisors is an integer number (153170433).

Almost surely, 2^981861625 is an apocalyptic number.

It is an amenable number.

981861625 is a deficient number, since it is larger than the sum of its proper divisors (243501839).

981861625 is an equidigital number, since it uses as much as digits as its factorization.

981861625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7854908 (or 7854898 counting only the distinct ones).

The product of its digits is 207360, while the sum is 46.

The square root of 981861625 is about 31334.6712923560. The cubic root of 981861625 is about 993.9169464915.

The spelling of 981861625 in words is "nine hundred eighty-one million, eight hundred sixty-one thousand, six hundred twenty-five".