1313500121 has 8 divisors (see below), whose sum is σ = 1391167944. Its totient is φ = 1235877120.

The previous prime is 1313500091. The next prime is 1313500193. The reversal of 1313500121 is 1210053131.

It can be written as a sum of positive squares in 4 ways, for example, as 671587225 + 641912896 = 25915^2 + 25336^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 1313500121 - 2¹⁸ = 1313237977 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17).

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 1313500121.

It is not an unprimeable number, because it can be changed into a prime (1313500021) 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 7 ways as a sum of consecutive naturals, for example, 63371 + ... + 81503.

It is an arithmetic number, because the mean of its divisors is an integer number (173895993).

Almost surely, 2^1313500121 is an apocalyptic number.

It is an amenable number.

1313500121 is a deficient number, since it is larger than the sum of its proper divisors (77667823).

1313500121 is a wasteful number, since it uses less digits than its factorization.

1313500121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22411.

The product of its (nonzero) digits is 90, while the sum is 17.

The square root of 1313500121 is about 36242.2422181630. The cubic root of 1313500121 is about 1095.1578127183.

Adding to 1313500121 its reverse (1210053131), we get a palindrome (2523553252).

The spelling of 1313500121 in words is "one billion, three hundred thirteen million, five hundred thousand, one hundred twenty-one".