521454653 has 4 divisors (see below), whose sum is σ = 535548060. Its totient is φ = 507361248.

The previous prime is 521454641. The next prime is 521454667. The reversal of 521454653 is 356454125.

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 297114169 + 224340484 = 17237^2 + 14978^2 .

It is a cyclic number.

It is not a de Polignac number, because 521454653 - 2¹⁰ = 521453629 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521454623) 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, 7046648 + ... + 7046721.

It is an arithmetic number, because the mean of its divisors is an integer number (133887015).

Almost surely, 2^521454653 is an apocalyptic number.

It is an amenable number.

521454653 is a deficient number, since it is larger than the sum of its proper divisors (14093407).

521454653 is a wasteful number, since it uses less digits than its factorization.

521454653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14093406.

The product of its digits is 72000, while the sum is 35.

The square root of 521454653 is about 22835.3816039934. The cubic root of 521454653 is about 804.8942947247.

The spelling of 521454653 in words is "five hundred twenty-one million, four hundred fifty-four thousand, six hundred fifty-three".