981057521 has 8 divisors (see below), whose sum is σ = 984939744. Its totient is φ = 977184000.

The previous prime is 981057509. The next prime is 981057523. The reversal of 981057521 is 125750189.

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

It is a cyclic number.

It is not a de Polignac number, because 981057521 - 2¹⁰ = 981056497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (981057523) 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, 300146 + ... + 303396.

It is an arithmetic number, because the mean of its divisors is an integer number (123117468).

Almost surely, 2^981057521 is an apocalyptic number.

It is an amenable number.

981057521 is a deficient number, since it is larger than the sum of its proper divisors (3882223).

981057521 is a wasteful number, since it uses less digits than its factorization.

981057521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4351.

The product of its (nonzero) digits is 25200, while the sum is 38.

The square root of 981057521 is about 31321.8377653675. The cubic root of 981057521 is about 993.6455467867.

The spelling of 981057521 in words is "nine hundred eighty-one million, fifty-seven thousand, five hundred twenty-one".