1040201521 has 4 divisors (see below), whose sum is σ = 1040275044. Its totient is φ = 1040128000.

The previous prime is 1040201489. The next prime is 1040201537. The reversal of 1040201521 is 1251020401.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 831687921 + 208513600 = 28839^2 + 14440^2 .

It is a cyclic number.

It is not a de Polignac number, because 1040201521 - 2⁵ = 1040201489 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1040201495 and 1040201504.

It is not an unprimeable number, because it can be changed into a prime (1040201221) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 8080 + ... + 46321.

It is an arithmetic number, because the mean of its divisors is an integer number (260068761).

Almost surely, 2^1040201521 is an apocalyptic number.

It is an amenable number.

1040201521 is a deficient number, since it is larger than the sum of its proper divisors (73523).

1040201521 is an equidigital number, since it uses as much as digits as its factorization.

1040201521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73522.

The product of its (nonzero) digits is 80, while the sum is 16.

The square root of 1040201521 is about 32252.1552923212. The cubic root of 1040201521 is about 1013.2248396247.

Adding to 1040201521 its reverse (1251020401), we get a palindrome (2291221922).

The spelling of 1040201521 in words is "one billion, forty million, two hundred one thousand, five hundred twenty-one".