981520 has 20 divisors (see below), whose sum is σ = 2282220. Its totient is φ = 392576.

The previous prime is 981517. The next prime is 981523. The reversal of 981520 is 25189.

981520 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (981517) and next prime (981523).

It can be written as a sum of positive squares in 2 ways, for example, as 685584 + 295936 = 828^2 + 544^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is not an unprimeable number, because it can be changed into a prime (981523) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6055 + ... + 6214.

It is an arithmetic number, because the mean of its divisors is an integer number (114111).

2⁹⁸¹⁵²⁰ is an apocalyptic number.

It is an amenable number.

981520 is an abundant number, since it is smaller than the sum of its proper divisors (1300700).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

981520 is a wasteful number, since it uses less digits than its factorization.

981520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12282 (or 12276 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 25.

The square root of 981520 is about 990.7169121399. The cubic root of 981520 is about 99.3801659960.

The spelling of 981520 in words is "nine hundred eighty-one thousand, five hundred twenty".