1313406521 has 16 divisors (see below), whose sum is σ = 1600051200. Its totient is φ = 1053016848.

The previous prime is 1313406511. The next prime is 1313406527. The reversal of 1313406521 is 1256043131.

It is a cyclic number.

It is not a de Polignac number, because 1313406521 - 2²² = 1309212217 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1313406527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 51995 + ... + 73008.

It is an arithmetic number, because the mean of its divisors is an integer number (100003200).

Almost surely, 2^1313406521 is an apocalyptic number.

It is an amenable number.

1313406521 is a deficient number, since it is larger than the sum of its proper divisors (286644679).

1313406521 is a wasteful number, since it uses less digits than its factorization.

1313406521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125108.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 1313406521 is about 36240.9508843242. The cubic root of 1313406521 is about 1095.1317984569.

Adding to 1313406521 its reverse (1256043131), we get a palindrome (2569449652).

The spelling of 1313406521 in words is "one billion, three hundred thirteen million, four hundred six thousand, five hundred twenty-one".