981521045 has 8 divisors (see below), whose sum is σ = 1200048696. Its totient is φ = 770401216.

The previous prime is 981521033. The next prime is 981521071. The reversal of 981521045 is 540125189.

It can be written as a sum of positive squares in 4 ways, for example, as 12630916 + 968890129 = 3554^2 + 31127^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-981521045 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 981520996 and 981521014.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1851662 + ... + 1852191.

It is an arithmetic number, because the mean of its divisors is an integer number (150006087).

Almost surely, 2^981521045 is an apocalyptic number.

It is an amenable number.

981521045 is a deficient number, since it is larger than the sum of its proper divisors (218527651).

981521045 is a wasteful number, since it uses less digits than its factorization.

981521045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3703911.

The product of its (nonzero) digits is 14400, while the sum is 35.

The square root of 981521045 is about 31329.2362658268. The cubic root of 981521045 is about 993.8020126515.

The spelling of 981521045 in words is "nine hundred eighty-one million, five hundred twenty-one thousand, forty-five".