1513340737721 has 2 divisors, whose sum is σ = 1513340737722. Its totient is φ = 1513340737720.

The previous prime is 1513340737693. The next prime is 1513340737723. The reversal of 1513340737721 is 1277370433151.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1495582243600 + 17758494121 = 1222940^2 + 133261^2 .

It is an emirp because it is prime and its reverse (1277370433151) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1513340737721 - 2²⁶ = 1513273628857 is a prime.

Together with 1513340737723, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1513340737723) 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 as a sum of consecutive naturals, namely, 756670368860 + 756670368861.

It is an arithmetic number, because the mean of its divisors is an integer number (756670368861).

Almost surely, 2^{1513340737721} is an apocalyptic number.

It is an amenable number.

1513340737721 is a deficient number, since it is larger than the sum of its proper divisors (1).

1513340737721 is an equidigital number, since it uses as much as digits as its factorization.

1513340737721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 370440, while the sum is 44.

The spelling of 1513340737721 in words is "one trillion, five hundred thirteen billion, three hundred forty million, seven hundred thirty-seven thousand, seven hundred twenty-one".