1023413521 has 12 divisors (see below), whose sum is σ = 1107183196. Its totient is φ = 940383360.

The previous prime is 1023413513. The next prime is 1023413539. The reversal of 1023413521 is 1253143201.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 34939921 + 988473600 = 5911^2 + 31440^2 .

It is not a de Polignac number, because 1023413521 - 2³ = 1023413513 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1023413492 and 1023413501.

It is not an unprimeable number, because it can be changed into a prime (1023413561) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1025995 + ... + 1026991.

Almost surely, 2^1023413521 is an apocalyptic number.

It is an amenable number.

1023413521 is a deficient number, since it is larger than the sum of its proper divisors (83769675).

1023413521 is an frugal number, since it uses more digits than its factorization.

1023413521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1572 (or 1291 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 1023413521 is about 31990.8349531549. The cubic root of 1023413521 is about 1007.7443768040.

Adding to 1023413521 its reverse (1253143201), we get a palindrome (2276556722).

The spelling of 1023413521 in words is "one billion, twenty-three million, four hundred thirteen thousand, five hundred twenty-one".