1023521313 has 8 divisors (see below), whose sum is σ = 1366472800. Its totient is φ = 681458688.

The previous prime is 1023521299. The next prime is 1023521333. The reversal of 1023521313 is 3131253201.

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

It is a de Polignac number, because none of the positive numbers 2^k-1023521313 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1023521313.

It is not an unprimeable number, because it can be changed into a prime (1023521333) 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, 219523 + ... + 224136.

It is an arithmetic number, because the mean of its divisors is an integer number (170809100).

Almost surely, 2^1023521313 is an apocalyptic number.

It is an amenable number.

1023521313 is a deficient number, since it is larger than the sum of its proper divisors (342951487).

1023521313 is an equidigital number, since it uses as much as digits as its factorization.

1023521313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 444431.

The product of its (nonzero) digits is 540, while the sum is 21.

The square root of 1023521313 is about 31992.5196413162. The cubic root of 1023521313 is about 1007.7797561060.

Adding to 1023521313 its reverse (3131253201), we get a palindrome (4154774514).

The spelling of 1023521313 in words is "one billion, twenty-three million, five hundred twenty-one thousand, three hundred thirteen".