994145521 has 4 divisors (see below), whose sum is σ = 997734772. Its totient is φ = 990556272.

The previous prime is 994145519. The next prime is 994145543. The reversal of 994145521 is 125541499.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 367143921 + 627001600 = 19161^2 + 25040^2 .

It is a cyclic number.

It is not a de Polignac number, because 994145521 - 2¹ = 994145519 is a prime.

It is a super-3 number, since 3×994145521³ (a number of 28 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (994145501) 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, 1794210 + ... + 1794763.

It is an arithmetic number, because the mean of its divisors is an integer number (249433693).

Almost surely, 2^994145521 is an apocalyptic number.

It is an amenable number.

994145521 is a deficient number, since it is larger than the sum of its proper divisors (3589251).

994145521 is a wasteful number, since it uses less digits than its factorization.

994145521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3589250.

The product of its digits is 64800, while the sum is 40.

The square root of 994145521 is about 31530.0732793313. The cubic root of 994145521 is about 998.0446862400.

The spelling of 994145521 in words is "nine hundred ninety-four million, one hundred forty-five thousand, five hundred twenty-one".