521726401 has 8 divisors (see below), whose sum is σ = 604427264. Its totient is φ = 441067680.

The previous prime is 521726393. The next prime is 521726417. The reversal of 521726401 is 104627125.

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

It is a cyclic number.

It is not a de Polignac number, because 521726401 - 2³ = 521726393 is a prime.

It is a super-3 number, since 3×521726401³ (a number of 27 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 521726401.

It is not an unprimeable number, because it can be changed into a prime (521726441) 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, 509985 + ... + 511006.

It is an arithmetic number, because the mean of its divisors is an integer number (75553408).

Almost surely, 2^521726401 is an apocalyptic number.

It is an amenable number.

521726401 is a deficient number, since it is larger than the sum of its proper divisors (82700863).

521726401 is a wasteful number, since it uses less digits than its factorization.

521726401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1021071.

The product of its (nonzero) digits is 3360, while the sum is 28.

The square root of 521726401 is about 22841.3309813592. The cubic root of 521726401 is about 805.0340898337.

The spelling of 521726401 in words is "five hundred twenty-one million, seven hundred twenty-six thousand, four hundred one".