1040205521 has 8 divisors (see below), whose sum is σ = 1142560320. Its totient is φ = 942611472.

The previous prime is 1040205497. The next prime is 1040205533. The reversal of 1040205521 is 1255020401.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1040205521 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1040205493 and 1040205502.

It is not an unprimeable number, because it can be changed into a prime (1040205721) 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, 1189730 + ... + 1190603.

It is an arithmetic number, because the mean of its divisors is an integer number (142820040).

Almost surely, 2^1040205521 is an apocalyptic number.

It is an amenable number.

1040205521 is a deficient number, since it is larger than the sum of its proper divisors (102354799).

1040205521 is a wasteful number, since it uses less digits than its factorization.

1040205521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2380375.

The product of its (nonzero) digits is 400, while the sum is 20.

The square root of 1040205521 is about 32252.2173036212. The cubic root of 1040205521 is about 1013.2261383776.

Adding to 1040205521 its reverse (1255020401), we get a palindrome (2295225922).

The spelling of 1040205521 in words is "one billion, forty million, two hundred five thousand, five hundred twenty-one".