513051621 has 4 divisors (see below), whose sum is σ = 684068832. Its totient is φ = 342034412.

The previous prime is 513051613. The next prime is 513051659. The reversal of 513051621 is 126150315.

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 513051621 - 2³ = 513051613 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 513051591 and 513051600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (513051611) 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, 85508601 + ... + 85508606.

It is an arithmetic number, because the mean of its divisors is an integer number (171017208).

Almost surely, 2^513051621 is an apocalyptic number.

It is an amenable number.

513051621 is a deficient number, since it is larger than the sum of its proper divisors (171017211).

513051621 is a wasteful number, since it uses less digits than its factorization.

513051621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171017210.

The product of its (nonzero) digits is 900, while the sum is 24.

The square root of 513051621 is about 22650.6428385598. The cubic root of 513051621 is about 800.5473447026.

The spelling of 513051621 in words is "five hundred thirteen million, fifty-one thousand, six hundred twenty-one".