530686921 has 4 divisors (see below), whose sum is σ = 548986500. Its totient is φ = 512387344.

The previous prime is 530686901. The next prime is 530686927. The reversal of 530686921 is 129686035.

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 154753600 + 375933321 = 12440^2 + 19389^2 .

It is a cyclic number.

It is not a de Polignac number, because 530686921 - 2²¹ = 528589769 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (530686927) 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, 9149746 + ... + 9149803.

It is an arithmetic number, because the mean of its divisors is an integer number (137246625).

Almost surely, 2^530686921 is an apocalyptic number.

It is an amenable number.

530686921 is a deficient number, since it is larger than the sum of its proper divisors (18299579).

530686921 is a wasteful number, since it uses less digits than its factorization.

530686921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18299578.

The product of its (nonzero) digits is 77760, while the sum is 40.

The square root of 530686921 is about 23036.6430063063. The cubic root of 530686921 is about 809.6167068313.

The spelling of 530686921 in words is "five hundred thirty million, six hundred eighty-six thousand, nine hundred twenty-one".