513151220321 has 4 divisors (see below), whose sum is σ = 513153102000. Its totient is φ = 513149338644.

The previous prime is 513151220269. The next prime is 513151220327. The reversal of 513151220321 is 123022151315.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 513151220321 - 2¹⁴ = 513151203937 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (513151220327) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 444491 + ... + 1106288.

It is an arithmetic number, because the mean of its divisors is an integer number (128288275500).

Almost surely, 2^513151220321 is an apocalyptic number.

It is an amenable number.

513151220321 is a deficient number, since it is larger than the sum of its proper divisors (1881679).

513151220321 is a wasteful number, since it uses less digits than its factorization.

513151220321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1881678.

The product of its (nonzero) digits is 1800, while the sum is 26.

Adding to 513151220321 its reverse (123022151315), we get a palindrome (636173371636).

The spelling of 513151220321 in words is "five hundred thirteen billion, one hundred fifty-one million, two hundred twenty thousand, three hundred twenty-one".