521694481 has 8 divisors (see below), whose sum is σ = 650424384. Its totient is φ = 406515120.

The previous prime is 521694479. The next prime is 521694497. The reversal of 521694481 is 184496125.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 521694481 - 2¹ = 521694479 is a prime.

It is a super-2 number, since 2×521694481² = 544330263011718722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (521694401) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3387550 + ... + 3387703.

It is an arithmetic number, because the mean of its divisors is an integer number (81303048).

Almost surely, 2^521694481 is an apocalyptic number.

It is an amenable number.

521694481 is a deficient number, since it is larger than the sum of its proper divisors (128729903).

521694481 is a wasteful number, since it uses less digits than its factorization.

521694481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6775271.

The product of its digits is 69120, while the sum is 40.

The square root of 521694481 is about 22840.6322373090. The cubic root of 521694481 is about 805.0176717698.

The spelling of 521694481 in words is "five hundred twenty-one million, six hundred ninety-four thousand, four hundred eighty-one".