513151053421 has 4 divisors (see below), whose sum is σ = 513158189500. Its totient is φ = 513143917344.

The previous prime is 513151053407. The next prime is 513151053509. The reversal of 513151053421 is 124350151315.

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 270186842025 + 242964211396 = 519795^2 + 492914^2 .

It is a cyclic number.

It is not a de Polignac number, because 513151053421 - 2²⁵ = 513117498989 is a prime.

It is a super-5 number, since 5×513151053421⁵ (a number of 60 digits) contains 55555 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (513151053221) 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, 3459066 + ... + 3604363.

It is an arithmetic number, because the mean of its divisors is an integer number (128289547375).

Almost surely, 2^513151053421 is an apocalyptic number.

It is an amenable number.

513151053421 is a deficient number, since it is larger than the sum of its proper divisors (7136079).

513151053421 is an equidigital number, since it uses as much as digits as its factorization.

513151053421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7136078.

The product of its (nonzero) digits is 9000, while the sum is 31.

The spelling of 513151053421 in words is "five hundred thirteen billion, one hundred fifty-one million, fifty-three thousand, four hundred twenty-one".