1513365121 has 4 divisors (see below), whose sum is σ = 1518751044. Its totient is φ = 1507979200.

The previous prime is 1513365103. The next prime is 1513365131. The reversal of 1513365121 is 1215633151.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 938564496 + 574800625 = 30636^2 + 23975^2 .

It is a cyclic number.

It is not a de Polignac number, because 1513365121 - 2⁵ = 1513365089 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 1513365121.

It is not an unprimeable number, because it can be changed into a prime (1513365131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2692540 + ... + 2693101.

It is an arithmetic number, because the mean of its divisors is an integer number (379687761).

Almost surely, 2^1513365121 is an apocalyptic number.

It is an amenable number.

1513365121 is a deficient number, since it is larger than the sum of its proper divisors (5385923).

1513365121 is an equidigital number, since it uses as much as digits as its factorization.

1513365121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5385922.

The product of its digits is 2700, while the sum is 28.

The square root of 1513365121 is about 38901.9937920925. The cubic root of 1513365121 is about 1148.1040267297.

Adding to 1513365121 its reverse (1215633151), we get a palindrome (2728998272).

The spelling of 1513365121 in words is "one billion, five hundred thirteen million, three hundred sixty-five thousand, one hundred twenty-one".